So, pretty much like the thread going in the paladin forums, this thread will be for any and all Shaman discussion that goes on during Blizzcon.  I am running the stream and will try to update this thread consistantly throughout the convention.
Day 1 Confirmed Information:
-The new Cataclysm official website includes a screenshot showing various goblins in tier 8 armor, signifying some of the classes that will be available to them.  This apparently includes Goblin Shaman.  As seen on the front page, Dwarf Shaman have also been added.
MP5 GONE. Replaced with Spirit.  All healers will recieve some sort of meditation-like skill.
Spell power GONE.  Intellect is finally worth a shit, it now provides both mana and spell power.  Mana no longer an issue for Enhancement.
Attack power GONE.  Agility now provides 2 AP for rogues, hunters, shaman, and druids.
Armor Penetration GONE.  Too confusing/mathy.  Being replaced by a stat called Mastery, details to come in the Systems Panel tomorrow.  "Whatever you like to do, Mastery makes you better at it" is the description for now.
Haste.  All the other skills said GONE next on the slideshow.  Haste said "Push more buttons," will increase rate at which you gain your secondary resource.  Talent(s) will be implemented to make this work for enhance.
Block Value GONE.  Block will be percentage-based.
Since so many of the other stats are disappearing, Stamina will increase for everyone.  "No more plate HP envy" according to the slideshow.
Day 1 Speculation/Unconfirmed Infoz:
Major upheavel among the elements, introduction of the Elemental Planes, most predominantly Deepholm and The Firelands.  What this means for Shaman specifically is yet to be seen, but I refuse to believe that it won't have some importance.
For clarity: Some of the stats listed as gone means they're gone from the gear itemization, mainly talking about AP/SP here. They'll still basically exist, just acquired via other stats.