The roadmaps are basically public knowledge. You can see what they're developing several years out on their own website. Apple does need chips for fine tuning. They probably receive pre production chips for testing. You have to allow a little wiggle room on these things. Bugs pop up. Specs can be a little off, and production can take time to ramp up.
There were already several Ivy Bridge based laptops at CES. Big OEMs like Apple work very closely with Intel and definitely get their hands on engineering samples.
I'll do some research now and post my predictions soon, as people seemed to like them last year