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The ongoing yarn about General Motors fielding a brace of rear-wheel drive flagship sedans based on a new generation Premium Zeta platform has hit the big time, with Motor Trend reporting that the platform will underpin a sport sedan for Chevrolet. Last month, the rejigged Zeta was touted as the basis for a flagship Buick that would finally, and properly, challenge Lexus. MT's report says there will be two wheelbases for this new Zeta, and that those two variants will do duty under a Cadillac, a

We can quit wondering where General Motors is heading with Buick. Maybe. If rumors dusting up from GM Inside News are to be believed, company leadership has the Tri-Shield's sights trained solidly on Lexus. We all know that the 2010 Buick LaCrosse was positioned as the answer to the Lexus ES 350, but supposedly, GM is aiming even higher and cooking up a Zeta-based sedan to go head-to-head with the Lexus LS. If you believe the hype, design work has already been given the go-ahead, but production