The Beta patch notes have been released and posted in several locations. There's a new logon screen graphic. And even the starting cinematic
Deathknights will be using a "relic" in their ranged slot. And they'll have a "death gate" spell which (much like druids) ports them back to their main trainer location. Ebon Hold in this case.
Deathknights also get a rune system. No, not the three types of runes you were probably thinking of. A craftable rune which will act as a temporary enchant much like rogue poisons.
So, about those Patch notes. I'll list some of the interesting highlights.
Nothing too interesting for Mages in the patch notes other than reduced mana for several spells. So, I'll list the info about the main three classes I've been writing about so far.
Faerie Fire (Feral): Now an 11-point talent, down from being a 21-point talent.
A major overhaul has been done on pets, each pet type now gets a unique ability and instead of pet training points pets now have a talent tree of their very own.
All pet families now have one unique ability. New abilities have been added for families such as bears and sporebats.