Well hopefully not Cat, because she is finally coming out of her shell...
But to be honest it could be anyone, from what I've seen searching around forums, twitter and tumblr Katie seems to be the most likely to go as she does not have a big fan following and seems to be quite hated. Unlike Travis whom is very much despised, but still has a great fan following.
I think most of Jason's fans will vote for Dion, (I hope he goes) but from what I'm seeing Dion has hardly any fans. He's hardly talked about unless with Jason. So if Jason's fans don't vote, he may be the one evicted, which to most is the best scenario. Priya will be another Estelle/Tahan who you either hate or love... And she seems to be most popular especially on these forums... on twitter not so much.
And finally baby Cat, she did have a following before today due to her sweetness and intelligence. Lost a few supporters due to the Lawson stuff. But after today I've seen her gain a staggering amount of support, standing up to Lisa and all that. Which is were as lot of Katie negativity is coming from. But Cat will have to have a lot of screen time this week and more involvement in the future to get a cross the line.
In a perfect world Lisa would be nominated and we could finally say goodbye to her... But ultimately it's between Katie, Cat and Dion to go.