My Opinions:
Marquez will fight for the World Chmapionship and in my opinion will do it again this year.
Lorenzo will make the Duc work and fight for the World Championship title. He also have Stoner and Biaggi as partners helping him to do so. Lorenzo is a good rain rider we have seen in previous years before the michelin tire time. So if he can figure out how to race with the michelin tires in the rain, he will be ahead of the game, because we have seen the ducati s do extremely well in the rain. In the tests he was already pretty close to the top times.
Iaonne will be bad ass competitor on his suzuki and fight for wins, but I am not sure if he can produce it consistently, he is a guy who is racing, winning and crushing his bike….
Rossi will fight for the World Championship title, but I think he won't catch the title this year. Competition Level is extremely High and Consistent.
Vinales will fight for the top as well, but won't have the consistency.
Cheers