Like a ballsy update to majority of skills for each class, updates to dungeons that change the way they are being done, new fractals, the vague and ever ambiguous "moar content" delivered in one big juicy chunk.
For someone like me, an update to TP is pretty huge but I can say with certainty that lots of people will react with "WTF, still no mounts?!".
But then again, the thing about MMOs is that no matter what you do, nothing will please the vocal community of forum whiners. Some people just play to complain.
TP update is nice but it honestly isn't worth much for someone who is simply bored of the core game. The reason is simple: the main game experience that they are bored of is not altered by the TP change. So even if selling items is now less painful, the game itself is still boring for them. Would you go back to some old mmo just because of slightly altered UI? If you would, then perhaps you shouldn't have left in the first place.
Hell, I'd be embarrassed to even ask a veteran player to return because "we have new TP UI".
I still want to add that I don't think the features of the patch are bad. It's just that they aren't going to cure people's boredom.