Can provide extra readouts like tire pressure, locked or unlocked, etc. on the little screen. Without a doubt, and for whatever reason, it is getting the most posts, questions, etc. on so many GM boards...people just like gadgets.
It doesn't seem to be available yet, but keep asking your dealers, about the accessory.
Is the GM Personal Audio Link (iPod setup) going to be compatible with the 07 and 08 escalades? It'd be nice to have some OEM iPod functionality finally in the escalade. The 3rd party products come pretty close but none are without problems as far as I know.