No big secret here. Buick gave us a glimpse of its upcoming small sedan at the L.A. Auto Show late last year, so the fact that prototypes are running around Detroit is no big surprise.

Based on the same platform as the Cruze, this new Buick will mostly likely share drivetrains and suspension components. Most of the Buick-ness will be baked into the final suspension tuning and cabin isolation. Safe to adopt it will get a big ol' list of standard features too. Look for an official debut sometime later this year.

Buick Gives Sneek Peek of New Sedan at L.A. Auto Show