I don't have inside knowledge, just over a decade working with and being a fan of Macs.
two basic levels, each with configurable options (duh), both with the new iLife suite, and aluminum cases, 2 " thick form factor.
ONE:
2.33 Ghz Core 2 Duo
1 GB 667Mhz DDR2 SDRAM
500 GB S-ATA 7200 RPM Hard Drive
16X Superdrive
NVidia GeForce 8600 GT (256 MB) DDR3 video card
backlit Keyboard (w/ hotkeys) and Mighty Mouse
Built in iSight
Airport Extreme (n built-in)
Bluetooth +EDR
20" OLED Screen
Remote Control for Front Row
Optical audio in/out
Built-in Stereo speakers
$1499.99
TWO:
2.4 Ghz Core 2 Duo
1 GB 667 Mhz DDR2 SDRAM
750 GB S-ATA (7200 RPM) Hard Drive
16X Superdrive
NVidia GeForce 8600 GT (256 MB) DDR3 video card
backlit Keyboard (w/ hotkeys) and Mighty Mouse
Built in iSight
Airport Extreme (n built-in)
Bluetooth +EDR
24" OLED Screen
Remote Control for Front Row
Optical audio in/out
Built-in Stereo speakers
$1999.99
Options:
Blu-ray drive
512 MB VRAM upgrade
standard stuff already offered