That's what it seems like from the promo.

Caroline just because Klaus said Katherine's suffering would last for at least 250 years.

I think Katherine or Caroline.

nah i reckon katherine, it would make it rather poetic from Klaus' POV, from katherine escaping him in the first place.

i think he is gonna want to use Katherine but idk if he will. He doesn't even know about Caroline. so that wouldn't be a plan but it could happen. i don't think that he is gonna use Damon or Stefan. and who knows if he needs all of those things. that was for the sun and moon curse but there is no curse. so how do we know??/

Or Caroline.

I think Klaus wants to drag out Katherine's suffering, so I'm saying either Caroline or Stefan :(

I dunno know, but I think that Kat will be :/

No way will it be Kat. He plans on making her suffer remember? She's asking to die and he isn't going to give her that. It would be the easy way out.

I reckon it will be Caroline. Mainly because she'll be easy to capture as opposed to Stefan who is stronger and more 'in-the-know' about things.

Can't see it being Damon, considering it looks like he's going to get bitten! (probably by Klaus with his vamp-wolf heritage!)

I kinda assume that it was him who made Jenna a vampire, and I can't see why he would do that if he didn't plan on using her for the Sacrifice.
I really don't want it to be Caroline! She's really one of my favourites in the show!!