Freedom of direction.
Train whatever whenever I want and have no general clue as to what to do at one moment rather than having my progression in-game be all mapped out.
"First you do this zone, then this zone, then these dailies, then this boss, then this raid, then this dungeon, then these quests..."
I like what they're going for with the compass.
Also, I do like player-designed stuff. Maybe housing, maybe markets.
Nothing PvP oriented, though. <- Want to make that clear. To add to that, nothing competitive either, really.
I also want to see WWWWWWWWWWWWWWWAAAAAAAAAAAAAAAAAAAAAAAAAAYYYYYYYYYYYYYYYY more support for RP'ers than we've currently seen.
Like, seriously. Please?!
Player economy, full on bzars and markets with rich stores and cruddy stalls.
Non combat players, farmers/miners and travelling merchant caravans.