The biggie so far is the new 15" MacBook Pro. As rumored, there's no optical drive any more. 2880x1800 pixel screen. Up to 16GB of RAM, 768GB SSD. Two thunderbolt ports, HDMI. (Dongles for Firewire 800 and GigE that hang off the Thunderbolt ports.). SD slot. USB 3.0. FaceTime HD, dual-microphones, new stereo speakers. 4.46 pounds. $2200 for the base model.

Surprisingly, they haven't introduced comparably amazing screen pixel densities into other laptop models.

Also curious is a "power nap" feature in OS X 10.8 where your laptop, when shut, is still doing work like fetching your email. I'm not entirely sure what I think about that. I'll bet airlines get unhappy about these laptops.