Here is how I envision the Mac product line by the end of 2012:
Macs:MacBook Air 11-inch - thinner at the thick end; potentially lighter
MacBook (13-inch) - The replacement of the 13-inch MacBook Air, will be very similar to the current one
MacBook Pro (13,15,17-inch) - MacBook Air styled, just with room for a dedicated GPU and better processor
iMac - Mostly the same, obviously just with upgraded specs. I love the iMac design
Mac Pro - Upgraded specs only +...