Since they haven't been released yet, and there are no basis for comparison aside from prototype models which rarely offer a true preview of actual product releases, it's impossible for anybody to say on that. It's doubtful, at least at first, that you'll see many, if any, of the high end Carrizo equipped units under the 800 dollar mark that surpass the current performance of the A10 units with Radeon graphics. The Carrizo-L units probably fit that category but it's doubtful that any of the less expensive models are going to be heavyweights. Then again, as I said, it's impossible to say until we see the data.
For light gaming and school work, any of the current A8 or A10 APUs would probably be fine. Are you looking towards 15" or 17"? 768 or 1080 resolution?
Do you require it to have an SSD or is a 7200RPM hard drive sufficient?