My plan for GM...
Chevrolet: Bread and butter, everyday vehicles...
Spark
Aveo (Sedan, 3/5 door hatchback)
Cruze (Coupe, Sedan)
Malibu (Epsilon-II, Coupe, Sedan)
Impala (RWD LWB Alpha)
Camaro (Zeta)
Corvette (Y-body)
Colorado (GMT-700)
Silverado (GMT-900)
Tahoe (GMT-900)
Suburban (GMT-900)
Avalanche (GMT900)
Production Orlando Concept (Delta-II)
Equinox (Theta-II)
Traverse (Lambda)
Pontiac: Affordable, RWD performance niche brand
G6 (SWB Alpha)
G8 (Zeta)
Solstice (Alpha)
Firebird...maybe. (Zeta)
Buick: Entry-level, comfortable luxury
Skylark (Small sedan, Delta-II FWD)
Regal (Chinese Buick Regal, sedan/hatchback/wagon)
LaCrosse (Epsilon II, FWD/AWD)
Rendezvous (Restyled, updated Saturn Vue, Theta-II)
Enclave (Lambda)
GMC: Upscale to luxury/commercial trucks, RWD/AWD/4WD only
Canyon (GMT-700)
Sierra (GMT-900)
Terrain (GMT-700 SUV)
Yukon (GMT-900, replaces current Escalade)
Yukon XL (GMT-900, replaces current Escalade ESV)
Avalanche-based truck (GMT-900, replaces current Escalade EXT)
Savana
Cadillac: RWD performance luxury cars, AWD crossovers
Compact sedan/coupe (SWB Alpha, BMW 3-series/Mercedes C-class fighter)
CTS (Sigma-II, BMW 5 series/Mercedes E-class fighter, sedan/coupe)
STS/DTS replacement (Zeta, Cadillac flagship)
SRX (Theta-Epsilon, AWD)
Escalade (Lambda, AWD) <-- It's going to happen anyways...
XLR (Y-body, redesigned)
And, if we find a bunch of money lying around...
Production Cien concept, limited production...maybe...