
So a director has been earmarked, well that certainly doesnt "prove" the film will be out in 2010, I think it's wishful thinking that we'll get a Bond film every two years (believe me I'd love to have one in 2010), but let's be realistic here, mounting up a big budget blockbuster is hard work, we're in a different time now, it's not unheard of for sequels to take 3 years to be released, even when they go into production immediately after the previous film.
A lot of factors contribute to Quantum being released when it was. Namely that it was a true sequel, I'm sure the writers had already mapped out Bond's character arc for the film when Casino was in the post production stage. And if Michell hadnt walked we might have gotten it in 2008 like they initially planned.
As for Bond in summer again? I don't think so, the summer season has changed a lot since Bond dominated it, now it's all about big budget blockbusters with all star casts...and sequels. If Quantum had come out in May like originally planned I dare say it would have got lost amidst all the tentpole films. But that's just me.