I'm inclined to think they'll do the transporting liquid one or something in pairs like BB15, but then I realized there's no way they'll have time to show that, strategy leading up to nominations, the nomination ceremony, AND the battle of the block on Sunday's episode.
I would think that, but like you stated, they would really have to cram a lot into Sunday's episode, and it wouldn't work out well.
Probably a quiz/majority rules type thing.