I would hazard a guess that multicoring neucleus might be on the list.
I dont think that support and developemnt for OS updats will be a biggie for them, apple bring out, what, one every 18 months or so. Not when the majority of the sales are for windows which has a longer product life cycle.
In the qualification charts for Mac's there are issues with graphics displays, not too sure if there what your having??
"No pressure, no diamonds" Thomas Carlyle