Merge is next week...let's do the maths....
5 Blue Collar
4 No Collar
3 White Collar
In the preview, Rodney clearly wants revenge on his other Blue Collars, so he won't work with them whatsoever. Not sure he's going to have a choice though as one side is bound to include a member of that tribe given all their dysfunction.
Sierra voted Joaquin out mostly because she liked Joe (although it also put her in a better position). I could see her joining up with Joe and the No Collars, so that gives them five.
Hali/Jenn/Joe/Sierra/Will...Dan/Kelly/Mike...Rodney...Carolyn...Tyler...Shirin
Some people that don't like each other are going to have to team up. Things are looking very good for No Collar though...they just need to grab a couple of stragglers. I'm thinking they grab Carolyn/Tyler - the two people that not coincidently were given the big strategist edits earlier in the season. They then take out the Blue Collar Trio and the remaining weirdos (Rodney/Shirin).
Tyler has both the emotional and strategic reason to work with that side. He gets revenge on the people that voted Joaquin out at the previous tribal council and also joins the majority. If No Collar are already five-strong, there's nowhere else for Tyler to go given that it will be next to impossible to cobble together a majority with the remaining players.
Likewise, Carolyn's most trustworthy allies will be the members of her current tribe (the three former No Collars) and Tyler from her previous tribe. Again, it's also the easiest way for her to get into the majority as not only will it be impossible to form a group with the other people, but Carolyn/Tyler both dislike Shirin immensely and working with the rest of the players would require them to have to work with Shirin in order to get a 7 person group going.
Winners are probably Jen, Tyler or Carolyn in that order. I could see an all No Collar Final Three with Jen clearly being the only major player in the bunch.