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.

Billee of Bloodscalp made a post reporting what he thought was a bug with Bloodlust/heroism:

“Bloodlust still gets removed if you use it when you are too close to a wall and cannot have your body made bigger by the buff. Im not sure if it removes it for the whole group if the caster is too close but i do know that it is removed if you are too close to a wall.

Im sure this is an unintended bug but it can be fairly game breaking to lose 750 mana on something that goes right away.”

To which Hortus replied

So it looks like when you pop Bloodlust/Heroism, make sure you and your groupmates are not standing right next to a wall. Kind of a dumb way to solve the problem, imo.

A few posts from Kalgan concerning class balance and representation in Arenas. I am a little surprised by the numbers for Shaman in 5v5 - the other brackets are about where most would expect shaman to be - underrepresented

         2v2     3v3     5v5

Druid	276.0%	184.0%	80.5%

Hunter	43.0%	50.2%	43.0%

Mage	8.7%	96.0%	96.0%

Paladin	19.7%	29.5%	147.4%

Priest	113.3%	164.8%	185.4%

Shaman	37.8%	50.4%	138.6%

Rogue	144.2%	175.1%	61.8%

Warlock	149.2%	93.2%	111.9%

Warrior	130.4%	90.7%	79.3%

And  for the 1850+ charts

Druid	184.0%	138.0%	92.0%

Hunter	50.2%	50.2%	50.2%

Mage	61.1%	87.3%	87.3%

Paladin	68.8%	88.4%	137.6%

Priest	133.9%	133.9%	154.5%

Shaman	75.6%	88.2%	138.6%

Rogue	154.5%	154.5%	82.4%

Warlock	121.2%	102.5%	102.5%

Warrior	90.7%	85.0%	85.0%

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.