(repost of a repost from our forums)
Interview with Tigole regarding the Wrath of the Lich King expansion
http://videos.curse.com/details/639/
Overview (some info from additional sources all subject to intepretation and change):
DeathKnights playable immediately after launch of the expansion (for players with existing "high level" characters on their account)
DeathKnights will start around level 55-60
Two level 70 dungeons available <both with a level 80 wing and heroic settings> as soon as you hit Northrend. One is centered heavily around the blue dragon flight
Two level 70 starting zones for both horde and alliance (think Hellfire Peninsula x2)
Malygos <leader of the Blue Flight> quick 25 man raid similiar to Onyxia, Gruul, Magtheridon (WTF Lore? Why are we killing off aspects again?)
Along with Zul'aman in patch 2.3 (prior to the expansion) new more powerful items being added to the current heroic badge vendors (might not be a bad idea to stock up after 2.2 but before 2.3)
New Zone in Northrend completely dedicated to PvP with Siege Weapons and destructable buildings of some type (possibly instanced version for BattleGroup PvP)
New Profession: Inscription which will allow players to make changes to their current spells/melee abilities, Longer range, higher damage, possible secondary effects, etc (Expect *HUGE* nerfs once people figure out how to min-max some abilities to uberness, still has a lot of promise though)
Finally (sortakindamaybe) retooling the Paladin Retributiion tree to make it more raid viable again (just in time for everyone to dump it in favor of DeathKnights)
GuildBank with a fully customizable permission list for donations and withdrawals of items, reagents/materials, *and* gold (About F'in time). There will also be a built in logging system for transactions viewable (don't know if it's open view or guild only) through the WoW website somehow
ALT LOVE:
They will be reducing the amount of xp required per level between 20-60, boosting XP from quests, *and* dungeon/mob xp for those levels to help get those alts on par with your mains faster (Sweet Raptor Jeebus)
ALT LOVE: Part Deux:
Dustwallow Marsh is getting new quest hubs/quests to freshen up the grind from 35-45 (No more STV required)
Reduction in the number of old world Elite quests specifically 35-45ish zones (nerfing them to Non-Elite quests) to help with soloability
BONUS: This change is coming in patch 2.3 prior to the expansion
Dev's are discussing lack of hunter viability in 5v5 arena and have mentioned giving Hunters a Mortal Strike-esque Shot (That'll make things interesting to say the least...Still in the discussion stage so don't get your panties in a bunch just yet)