Title contenders, least to most likely.
Suzuki will have one rider and little development. Basically no chance at the title.
Honda may not even have bikes, sponsorship is still up in the air. Rea is good but not championship material, IMO.
Ducati doesn't even have a factory team, although has good riders on private bikes. Twin is probably outclassed at the moment, but Checa could win several races and if he gets really lucky could factor in the championship, but I doubt it.
Kawasaki is totally new with good riders, but will face a learning curve and will not be competitive at the start at all tracks.
BMW has good riders and a good bike, but might be shooting itself in the foot by trying to save money. Hard to think of a team as a championship favorite that has never won a race, but BMW may have a breakout year. hard to tell.
Yamaha has great riders and a strong winning bike. Melandri may take to the Yamaha like a duck to water or like a Marco to a...Desmosedici. Again hard to say.
Aprilia has two of the best, most-experienced riders on a strong machine that looked unbeatable several times this year. Gear cam drive or not, the Priller is going to be fast. Given another year to sort it out, expect many poles and wins.
Final points assuming no injuries.