My predictions:
I didn't like Tommy at the beginning of the show, but he is finally breaking down, showing emotions and that he really does care for Nikkole. I still hope that they break up. Esp. after he said that he doesn't want to get married until he's 38. I don't think that he will propose and I think that he will leave the island alone.

I think that Catherine and Edmundo will stay together. I don't think that she has the guts to break up with him.

Shannon and John. He didn't cheat on her, so I feel like they will stay together. Even though she's a bit psycho, I still hope that they end up leaving the island together.

Mark and Kelly. This one is hard- partly b/c they were not on the island for the entire time. She keeps saying that she has changed so much and that she wished that she had more time. She also said that it felt great to be treated well. He has said that he doesn't know if throwing away 1.5 years and living together is worth it for Debbie. I feel like he was only into Debbie b/c she is a model and actress. When he listed the qualities that he liked about her- he said "she's a model and an actress. What guy would turn that down?" (or something to that effect) It doesn't seem like he is judging her on her personality, her brains, her ambition, etc. It seems more of surface relationship than a deep one. Plus, there is a scene w/ him crying and saying that he saw Kelly get in bed w/ Tom (eww). I think that he might want to stay together....and she will either dump his ass or say that things need to change in their relationship for them to stay together.