There are so many twist options going around now it's hard to know what to think, however this one seems unlikely.
The one I know that seems plausable is,
Ist evictee is out
Then the other three's fate falls to temporarly re-introduced old housemates to decide the second.
I think that's Nikki, Grace, Johnathan and AN Other.
For the Source and other posts see the thread:
http://www.thisisbigbrother.com/foru...ge=1#pid435280