I'm still playing WoW

. Still as Alliance on Thunderhorn though in Roses of Dawn.
We won the screenshot contest and got 25 beta keys, so I'm now mainly exploring tBC beta

. tBC is really cool, the new zones (only 4 open so far) look really good and if rep stays as it is now (not sure as xp is accelerated, dunno about rep) then you can get to honoured with the new factions easy by just questing. Each zone has several new factions and there's also a (different) PvP objective in each zone. The most fun so far is the one in Nagrand where you can do bombing runs on the village on a gryph

. Can't say much about class balance yet as level cap is only lvl 67 so far, but a shadowpriest is a lot of fun.
There are also some UI improvements, no more LFG channel, but instead a LFG/LFM panel, sort off similar to the one from DAoC. ALT + a spell casts in on yourself without having to switch targets. There's also a much improved character stats screen where you can select to see your melee/ranged/spell/defense stats in detail (amount of +dmg, +hit, +crit, def, etc.).
The new races are nice as well, got a Draenei shaman to 21 and there's lots of fun quests in the new starter zones. Only played a Blood Elf to lvl 5, so can't say much about them except that they do look good, but male BE dance is so gay :p.
Also, gear that drops in tBC is insanely good: greens (even lvl 55 ones) are equal or better than tier 1, blues are equal or better than tier 2, didn't see tBC epics yet

. At lvl 64 my priest has +350 spell damage, 6k hp (self-buffed) and over 7.2k mana :p.