Here are two of the biggest changes I see happening:
1. Under Ive, the visual language of iOS/OSX will now fall in line with the industrial design vision Ive has taken to market. No more leather bound books and sopping wet, candy coated UI design. Ive will be an inspirational leader; the internal rift will now have a clear, unified [modernist] vision.
2. Now under the same management team, iOS and OSX will unite to deliver a single OS for all devices. Experts speculate this management change is only good for the enterprise level, but I believe Apple sees the wisdom in Microsoft’s move.