mmo-champion.com reports:
Cataclysm Testing Will Start in April
Many people wonder when will the beta of Cataclysm will start, it’s time to (try to) answer that question!
As far as I know, the Beta is supposed to start in April. At this point it’s not very clear if there will be a Friends & Family Alpha, if there is one it hasn’t been widely advertised internally.

Quote from: Bornakk

Listed below are recent fixes we have applied to the game. Keep in mind that some of these changes may not be active until after the realm has been restarted.
To review previous in-game fixes, please visit:
3/24

The Glory of the Icecrown Raider (10 player) meta achievement no longer requires Neck-Deep in Vile to be completed.
For the Sindragosa encounter, Frost Breath cast under 35% HP no longer has a snare component and there are no longer diminishing returns on Taunt effects.
The High Test …

Death Knights
-  Icy Touch: This ability now causes a very high amount of threat
while the death knight is in Frost Presence.
-  Chains of Ice: The ability now innately applies Frost Fever to a
target.
-  Rune of Razorice: Now stacks 5 stacks of 2% Frost Vulnerability
instead of 10 stacks of 1% Frost Vulnerability. Proc chance changed
to 100%.

Talents
Blood
- Abomination’s Might: This effect is now passive instead of being a
proc on certain strikes. Rank 1 is 5% attack power and Rank 2 is 10%
attack power. The self strength buff remains unchanged.
-  Will of …

Quote from: Zarhym

I’m sure some of you noticed this in the 3.3.3 PTR patch notes:

Frozo the Renowned has moved into the Dalaran Magus Commerce Exchange and will be trading your Frozen Orbs for various other trade goods.