It's going to depend on how the car turns out at the start of the season, I think.
Jenson has been a bit vocal this season when the Brawn hasn't been working well, and obviously is more sensitive to the car than some other drivers. I think if he is in a car that performs to a good (not great) standard, but consistently, he is at his best, but he doesn't react well to variations in the car handling.
Hamilton, on the other hand, is a driver who will wring the neck of a car that isn't consistent and still drive it on the edge but often with disastrous results.
If the car is variable we could see Jenson getting decent consistent points scoring results and Hamilton falling off the track on some, winning on others. Give them both a really good McClaren which handles consistently, I think Button will get to grips with it and we're in for a close competition.
Either way, I have to say I think it's an exciting development for the fans and I'm really looking forward to next season
The most interesting thing I noticed was that Schumacher was putting faster laps in than Rosberg ( his team mate ) who is definitely no slouch.
Seems like he's got the pace vs the top of the talent still, just depends if his car is competitive vs the rest of the field.