From
http://en.wikipedia.org/wiki/GM_Epsilon_platform:
Note the reference to G6 below...
Epsilon 2
A new version of the Epsilon, dubbed Epsilon 2, will debut in 2008. It will be adaptable for front and all-wheel drive applications.
Although "crossover SUVs" were planned for the original Epsilon platform, none were produced. Epsilon 2 also has this vehicle type planned, but they are more likely to use the planned Theta Premium architecture.
Opel have reportedly designed a new flagship model based on Epsilon 2 which would succeed the Omega and also be offered by Saturn.
The Epsilon 2 will be used in the following vehicles:
2009 Opel Vectra
2010 Pontiac G6 (The debut of E2 G6 is dependent upon whether a refresh is made for 2007. It may be moved up to 2008 if there isn't one.)
2010 Buick LaCrosse
2010 Cadillac BLS (global)
2010 Saab 9-3
2010 Saab 9-5
2011 Chevrolet Malibu