I don't know if this has been mentioned before, but in a recent thread in the NASIOC News and Rumors section, http://forums.nasioc.com/forums/showthread.php?t=1179216, they quote a published source (Automotive News) about some details about the '08 Tribeca. Some points:
- 3.6L H-6 motor
- Improved access to the third row seats
- No change in exterior dimensions
- Improved styling