It's a championship race so I'd be surprised if we saw anything in the low 12:50s. I bet they'll reel off a bunch of 65s and go through 3200 somewhere around 8:40. Around 4 laps left someone will throw in a 61-2 and break up the field. With around 1000 left there will be another surge, maybe by Rupp or Farah, and we'll be left with 4 or 5 medal contenders. I'd be surprised if Lagat and Farah were not in this breakaway group. If the race goes this way I think Farah wins, Rupp is 3rd or 4th, Lagat is 2nd or 3rd. Winning time around 13:10. I have no idea where Solinsky will be in any scenario because he's suddenly become a headcase.
If it's more of a classic sit and kick race, with a winning time closer to 13:20 and 5 guys in medal contention on the final straightaway, I think Rupp and Solinsky's chances decline significantly. Farah is hurt by this second scenario as well but I'd still peg him as the favorite. No surprise, I think Lagat is the best bet to medal among the Americans. He has better PRs but more importantly he's shown he can handle any kind of race. I don't think Rupp and Solinsky are nearly as good when the pace is all over the place.
I think the only chance of KB running the 5k is if he wins the 10k and feels like he has nothing to lose. I think he's enough of an aerobic monster to win a WC 10k after a long layoff but I think he'd need more time/races to get up to speed for the 5k. In general the 5k requires more sharpness because more of the best runners concentrate on it, only jumping in 10ks occasionally.