A few weeks ago a thought occured to me about this years title battle, and based on the first race I think it could just be correct.
Next year the cars are going to be very different with the new engines so teams are already working on the design for next years cars. This causes a problem as there is a resource constraint for all teams so they have to make a call on how much they continue to develop this years car, vs what effort they put into Next Years car.
For most teams winning this years championship is very important, teams like Ferrari, Lotus, and Mercedes and McLaren who need a championship win after a few dismal years. They need to win to keep the sponsors happy.
Red Bull on the other hand probably don't need to win this year, having had 3 very successful years, one year taking a back seat won't hurt them, they could well be putting all their effort into next years car and just ticking over this year. I can see them not making too much of an effort this year, and hence not making much impact, with their eyes firmly focussed on having the best car for the 2014 season. This could make this years title challenge much more open.
I will probably now be proved completely wrong with a return to Red Bull dominance next weekend.