Updated 5:43 EST: listed the official patch notes instead of the expected patch notes.

It seems that 2.4 is going live today. MMO Champion has a very comprehensive roundup of what the patch is bringing to the table here

Shaman specific patch notes (note that the fix for Chain Lightning skipping CC targets has been REMOVED):

• Call of Thunder: (Rank 5) now gives 5% critical strike chance, down from 6%.
• Earth Shield: Mana cost reduced roughly in half, and charges reduced from 10 to 6.
• Elemental Focus: This buff will no longer be removed when Shamanistic Focus is triggered.
• Flametongue Weapon: Having different ranks of this enchantment cast on two different weapons will no longer cause the enchantments to trigger multiple times per swing.
• Ghost Wolf: Cast time reduced to 2 seconds, down from 3.
• The Global Cooldown of all Totems has been reduced to 1 seconds, down from 1.5 seconds.
• Healing Grace: This talent now reduces the chance your spells will be dispelled by 10/20/30%.The resistance to being dispelled modifier from this talent now applies correctly to Water Breathing.
• Rockbiter Weapon: Tooltip and error messages have been adjusted slightly.
• Shamanistic Rage is now a Physical ability instead of a Magic spell, and thus is no longer dispellable. It now reduces all damage taken by 30% and gives your successful melee attacks a chance to regenerate mana equal to 30% of your attack power. This lasts for 15 seconds with a 2 minute cooldown.
• Stormstrike has a new icon.
• Totem timer icons will now show up under your player portrait when you cast totem spells. Right-clicking a totem timer icon will destroy that totem.
• Toughness will now also reduce the duration of movement slowing effects on you by 10/20/30/40/50%.
• Tremor Totem now pulses every 3 seconds, down from 4 seconds.
• The Shaman spell Fire Nova Totem will no longer sometimes detonate without doing any damage.

This is what we have so far - the flametongue MS buff has indeed been removed:

• Call of Thunder: (Rank 5) now gives 5% critical strike chance.
• Chain Lightning: This ability will no longer jump to secondary targets which are under the effect of crowd-control spells that break on taking damage. i.e. Polymorph, Sap, etc.
• Earth Shield: Mana cost reduced roughly in half, and charges reduced from 10 to 6.
• Elemental Focus: This buff will no longer be removed when Shamanistic Focus is triggered.
• Flametongue Weapon: Having different ranks of this enchantment cast on two different weapons will no longer cause the enchantments to trigger multiple times per swing.
• Ghost Wolf: Cast time reduced to 2 seconds, down from 3.
• The Global Cooldown of all Totems has been reduced to 1 seconds, down from 1.5 seconds.
• Healing Grace: This talent now reduces the chance your spells will be dispelled by 10/20/30%.The resistance to being dispelled modifier from this talent now applies correctly to Water Breathing.
• Rockbiter Weapon: Tooltip and error messages have been adjusted slightly.
• Shamanistic Rage is now a Physical ability instead of a Magic spell, and thus is no longer dispellable. It now reduces all damage taken by 30% and gives your successful melee attacks a chance to regenerate mana equal to 30% of your attack power. This lasts for 15 seconds with a 2 minute cooldown.
• Stormstrike has a new icon.
• Totem timer icons will now show up under your player portrait when you cast totem spells. Right-clicking a totem timer icon will destroy that totem.
• Toughness will now also reduce the duration of movement slowing effects on you by 10/20/30/40/50%.
• Tremor Totem now pulses every 3 seconds, down from 4 seconds.
• The Shaman spell Fire Nova Totem will no longer sometimes detonate without doing any damage.

Notice that the wording has been changed for the Toughness entry. Movement slowing effects - so snares. They do not intend this to shorten duration on root type abilities.

Kalgan had this to say about the Flametongue change being reverted

Have been reverted on the PTR, according to game files.

Some patch changes for 2.4

• Flametongue debuff now removes 25% of healing efficiency on the target for 5 seconds and stack up to two times. The duration remains 5 seconds.

• Bloodlust/Heroism will, again, stack with Icy Veins.
• Bloodlust/Heroism will not stack with Power Infusion, however.

Wow, I am actually a little speechless. We are getting some actual.. buffs? Can it be? Is this for real? Am I dreaming? No? Wow ok, so here is what has been added to the PTR:

• The global cooldown on casting totems has been reduced. It is now 1 second instead of 1.5
• Flametongue Weapon now reduces the effectiveness of healing spells on your target by 50%. Lasts 5 seconds and refreshes every hit.
• Flametongue Totem damage effects now also reduce healing done to the target by 50% and lasts 5 seconds.
• Toughness now Increases your armor value from items by 2/4/6/8/10% and reduces the duration of movement impairing effects on you by -10/20/30/40/50%.
• Shamanistic rage now let you regenerate mana equal to 30% of your attack power instead of 15. Duration reduced to 15 seconds. (Was 30 seconds)

Item Changes

• All items that have the ability “Ghost Wolf Speed” have been changed so that the spell does not affect players above level 60. These items include [General's Mail Boots], [Marshal's Mail Boots],[Blood Guard's Mail Greaves], [Blood Guard's Mail Walkers] and [Knight-Lieutenant's Mail Greaves]

New Items

• [Ring of Harmonic Beauty] - drops in Sunwell Plateau

Last week, Blizzard removed all stamina from these items. Now it seems they have put stamina back on them, but not as much as before. Image thanks to World of Raids.

As some of you know, patch 2.4 has been on the PTR for a week or two now. Some of the changes have caused quite an uproar amongst the Shaman community. Below, I have listed the changes that are most relevant to shamans:

General

• Characters will now retain talented spell ranks so when they retalent they do not have to relearn the spells from trainers.
• Spell Haste: Spell haste now reduces the global cooldown on spells, down to a minimum of 1 second. This change does not apply to melee and ranged abilities.

Shaman

• Call of Thunder: (Rank 5) now gives 5% critical strike chance.
• Earth Shield: Mana cost reduced roughly in half, and charges reduced from 10 to 6.
• Elemental Focus: This buff will no longer be removed when Shamanistic Focus is triggered.
• Ghost Wolf: Cast time reduced to 2 seconds, down from 3.
• Healing Grace: This talent now reduces the chance your spells will be dispelled by 10/20/30%.The resistance to being dispelled modifier from this talent now applies correctly to Water Breathing.
• Nature�s Swiftness and Elemental Mastery now share a 10 second cooldown.
• Rockbiter Weapon: Tooltip and error messages have been adjusted slightly.
• Stormstrike has a new icon.
• Totem timer icons will now show up under your player portrait when you cast totem spells. Right-clicking a totem timer icon will destroy that totem.
• Tremor Totem now pulses every 3 seconds, down from 4.
• The Shaman spell Fire Nova Totem will no longer sometimes detonate without doing any damage.

Undocumented Changes

• Shamanistic Rage is now a physical buff instead of magical - it can no longer be dispelled!

Item Changes

Totems
[Totem of Living Water] - this now reduces base mana cost, instead of just mana cost.
[Totem of the Pulsing Earth] - Reduces the mana cost of Lightning Bolt by 27, instead of 25.

Weapons
[Gladiator's War Staff] - the weapon speed has been reduced to 2.00. Damage range lowered to 89-186 to maintain the same DPS.
[Merciless Gladiator's War Staff] - the weapon speed has been reduced to 2.00. Damage range lowered to 90-193 to maintain the same DPS.
[Vengeful Gladiator's Staff] - the weapon speed has been reduced to 2.00. Damage range lowered to 90-199 to maintain the same DPS.
[Vengeful Gladiator's Battle Staff] - the weapon speed has been reduced to 2.00. Damage range lowered to 90-199 to maintain the same DPS.

Enchants
[Greater Inscription of Faith] - now adds +11 spell damage in addition to other effects.