My take:
Fiat Yamaha: Rossi / Lorenzo
No change, move along, nothing to see here.
Tech 3 Yamaha: Edwards / Toesland
No change here either, move along, nothing to see.
Rizla Suzuki: Vermi / Cappers
No change, they will both get their chances again to put that baby blue bike on the top of the podium on a dry track.
Repsol Honda: Pedrosa / Dovi
Dovi will get his chance on the factory team and then learn, its a one man team and he ain't that man.
Marlboro Ducati: Stoner / Hayden
The rumors surrounding the Hayden move to Ducati are too much. I have a feeling this is either a done deal or close to it.
Gresini Honda: Nakano / De Angelis
If Nakano stays on Gresini there is no need to bring up Takahashi, as the granted Japanese rider is taken care of with Nakano's presence. I also don't see De Angelis moving from Gresnini Honda, I believe their major sponsor is an Italian company so having him there may be good for marketing, although when he "comes out" during the off season it may create a stir.
Melandri could also be here replacing De Angelis.
Kawasaki: Hopkins / De Puniet
We know Hopkins is going green for a few years (not sure how long though), but I have a feeling that the token French guy might be back with Kawa.
The following teams will be the hardest to try and guess, we probably won't hear much about who is going where on these teams until close to the end of the season as a lot of it depends on the riders performances on those teams. Melandri I have a feeling will be back on Honda somewhere, Guintoli and Elias may be gone. 250 riders that might come in, Bautista, Kallio, Simoncelli.
LCR Honda: Melandri or De Puniet stays or 250 rider?
I'm not sure what the politics are on LCR but it could be a possible seat to give Melandri back his Honda ride. We know Dorna wants a French rider so De Puniet is not gone, but he hasn't proved he deserves to stay on his current ride either, so perhaps Kawasaki will accept him back. LCR took a chance on a young rider a few years ago who now seems to be doing fairly well, maybe they will do the same and bring on a 250 rider?
Scot Honda: 250 rider (Kallio, Simoncelli, Bautista?)
Takahashi could be a possibility but I think unlikely since Nakano will stay in GP. Here again maybe a 250 rider?
Alice Ducati: Who knows? Biaggi! Hahaha.
This one will really be up in the air.
Really a tough call, I have a feeling they may give Guintoli another chance or possibly Elias another chance. There has been talk of Kallio coming to Ducati with the Alice team. Gibernau certainly wants to come back, but will Alice Ducati's crappy performance scare him away and/or they won't pay him what he wants?
Spies - wont come to Moto GP unless he gets on a factory ride (his preferred will be Suzuiki). He will wait one more year and ride in the AMA until either Vermi leaves or the most likely, Cappers retires.
West - looking for a WSS ride.
others possibly looking for work: Guintoli, Elias