I don't know, I feel like she would never really officially date Klaus, at least not while they still live in Mystic Falls, just because of everything he has done to hurt everyone she loves. I mean, maybe if he said he was genuinely sorry for everything, but he's not, he's a bad guy. So I can't see them hooking up, even though he is doing a good job wooing her right now.

With the way the TVD writers rush through things.. I think they will by the middle or end of the season.

*fingers crossed*

One of the things that is almost ruining the show but I still have faith. Honestly, Tyler deserves better and Klaus needs to stop being so pussy whipped and so OOC.

Hook up as in sex, no. I don't think Caroline would. But I never thought she'd agree to go on a date with Klaus AND enjoy it, sooo...
I do think Tyler and her could break up, though. They started this as a lie but in 407 it seemed like it could head to a real break up. I'm sure Tyler completely loves Caroline, so seeing her growing closer to Klaus, or at least not grossed out by Klaus as before, could make Tyler want to put a stop for some time.

This Klaroline thing really destroyed Klaus. He was really pathetic in the last episodes. :(
I think Forwood will break up, but Klaroline is never gonna happen anyway, JP already said that.

I don't want it to be very soon, I want to see more of them flirting and stuff like that. But they should be together in the end of S4. :)