I think renault will still be the team to beat, ferrari will be a lot closer mainly down to bridgestone being back to form. Mclaren seemed to have gone backwards a bit during the winter as their mercedes V8 doesn't seem to be very reliable. Honda now have a stronger driver line up and Red Bull now have Adrian Newey and ferrari engines so they could be going well.
I think it will be an interesting season this year and a lot closer but i am very interested to see how Massa gets on against M Schumacher, i think he'll be a lot closer then many people think.