When I first watched the previews for next week and saw Rob make a deal with Alicia, right after that you see his confessional, then bang back at camp and he is now talking to someone "I'm sorry that you feel that way" speech. Just before he started talking I saw two people sitting on the bench, then the close up of Rob.

To me it is clear that the two people he is talking to is Rupert and Jenna. Remember the foursome promised to these guys from Rob and Amber? Rupert is already feeling like Rob doesn't like him, then in his chat with Shii Ann it is reinforced that Rob is a dangerous immunity threat (and if Shii can figure that out, it must be obvious to all) and now Rupert may over hear the alliance promise made to Alicia.

Jenna and Rupert confront Rob about the "new deal" with Alicia and let him know that they feel they can't trust him anymore, that they are disgruntled with their original deal. To which Rob states "I'm sorry that you feel that way"...

With the merge coming it should be very interesting. Through editing we have seen Rupert picked on by Rob, Jenna has been UTR but to me it appears she is biding her time until it is time to strike, Tom is getting closer to Rupert, Alicia has always been an outsider to Chapera. Now you merge and bring in a hungry three of Lex, Shii, and Kathy (who may get wind of the stab in the back that Rob intends) and you get some interesting combos and this game is far from over.

I think Rob has made himself most vulnerable. Unlike Brian in S5 who hid his lies and alliance deals with everyone, Rob is about to be exposed for the fraud he is. Especially since Amber has also started making her own deals.