I'd much rather see the profile sidebar that featured all the latest blogs and status updates of the people you're following return first; not to mention a ''wall'' system that's actually functional. Also, wiki tasks, and a wiki HUB of some kind. Oh, and a way for people to be aware when you update your lists.
...I'd say quests are pretty low on the list of things I'd want to see return in any case, even though I would admittedly still enjoy seeing them one day make a comeback.
Ahhh. The good old days. That stuff really should of been addressed by now.