A heavily camouflaged prototype of the 2011 Buick LaCrosse was spotted by Autoblog.com reader Mike rolling around in Troy, Michigan. The second generation LaCrosse that will be sold in the United States and China is built on GM’s new global front-wheel-drive Epsilon II platform which was first introduced on the new Opel Insignia. The LaCrosse that will be offered with GM’s new 3.6-liter V6 powerplant is expected to hit Buick’s showrooms in during the first half of 2009 as a 2011 model. -More pics after the jump