Chevrolet SuperSport Sedan Coming in 2013, Wagon and Ute Body Styles Possible for Next Gen on Zeta II

General Motors sees a growing need for rear-wheel-drive cars in its product portfolio, and such an influx requires either an unimaginably flexible platform or a series of rear-drive component sets. Since "unimaginably flexible" isn't something GM does well, the company is in the midst of dropping, reworking, and creating rear-drive architectures. General Motors currently sells rear-drive cars built off of one of three architectures: Y-Car, Sigma, and Zeta. The first underpins only the Corvette—an anomaly in the company's platform strategy. But the latter two volume platforms grew from a program dating to the early 1990s called Global Rear-Wheel Drive (GRWD in GM-speak). The plan was to use GRWD to build some Cadillacs plus a slew of Holdens for Australia. GRWD was doomed to failure because the Cadillac models required significant cost increases that couldn't be absorbed by the Holdens, which are sold in vast numbers as razor-margined company cars. The project then splintered and evolved into Sigma and Zeta. from Car and Driver Blog http://blog.caranddriver.com

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