THE NEW G8

[BlueZ06]

@showtime

i looked it up

the current cts sts & srx are on sigma
the new '08 CTS is gonna be on sigma II along with 2009 sts & 2010 srx

some good info here.
General Motors Sigma platform - Wikipedia

'A so-called “Sigma Lite” variant might reach production in 2007 as a replacement for the reworked Zeta platform. These vehicles would be built with less-expensive components and would be sold by Buick, Chevrolet and Pontiac."

which leads me back to my question, why no AWD then?