Good one, empowah!
I've participated in these before, but I'll go again because I don't remember exactly what I advocated the last time:
Beta coupe and sedan, RWD entry-level. A real name, no alpha bullcrap. 2.4L standard, 6 speed manual/6 speed manumatic. 2.0 DI Turbo with GXP. Looks must emulate the flagship coupe and sedan (BMW does it). Value price point to blow competitors away. Hardware and looks to make it THE car to have if you're a kid, or just a kid at heart who loves to drive. This would be the hook to build loyalty to the Pontiac brand and keep buyers who'll want to move up within the brand.
Solstice roadster and closed hatchback. No other changes needed yet. Maybe a nice rich orange or bronze color, with saddle leather as an available interior.
Delta-based sportwagon to replace Vibe and Torrent, with AWD only. 2.4L standard with 6 speed manual/6 speed manumatic transmissions. Turbo version on GXP. Totally unique looks from sister car HHR.
What to do with Ep II? I know I don't want any more FWD Pontiacs, but I need a mid-size replacement for G6, called Grand Am, in coupe, sedan, soft top convertible, and perhaps even a wagon (BMW does it). What the hell, let's put this car on a short wheelbase Zeta with DI V6 engines of varying displacements, with a V8 coupe and convertible as the top dog (GTO). 6 speed manual/6 speed manumatic transmissions across the board.
Zeta long wheelbase sedan as flagship, with DI V6 standard in large displacement, V8 optional. 6 speed manumatic transmission. Optional V8 power up to 6.0L. Sister Impala would have 5.3L as top engine, this will give Pontiac room to breathe. Buick Invicta could have 6.0L, but in a slightly more sedate, upscale package.
All of these cars (Solstice is already nailed in looks) would have a new, distinctively Pontiac set of styling cues, meaning heritage without regression, to blow away the competition.
Great design without gimmick (ground effects are sooo 90's) and GM's most relevant new hardware (drivetrain) are what Pontiac needs to succeed.