They also include the GeForce GT 330M graphics chip, and
[Although NVIDIA does market their Optimus tech for dynamic GPU switching, the company tells AppleInsider that Apple is not using it for the implementation on the new MBPs. –MR]
The improved power handling lets the 15" and 17" models go up to 8-9 hours on one battery charge. All MBPs now include 4GB of RAM standard.
The 15" model adds new display options: the normal, glossy 1440x900 screen, or a denser 1680x1050 panel with either glossy or matte coatings. The 17" display is a glossy 1920x1200 behemoth.
The 13" keeps the Core 2 Duo chip but bumps up maximum speed to 2.66GHz, and adds the GeForce 320M graphics card. Battery life is up to 10 hours.
The 13" low-end unit price is $1199; the top-end 17" model now goes for $2299 but does not include the i7 chip, which is only available as a preconfigured option on the highest-end 15" ($2199). You can get the i7 as a BTO option on the 17" model.
More in a moment...
Thanks to everyone for your tips and tweets.