My guess is it will be using the Voltec based power train used in the Malibu Hybrid. I'm also assuming it will go on sale in the US. Looking forward to reading the reviews.
http://media.gm.com/media/cn/en/gm/...6/April/0407_All-New-Buick-LaCrosse-Hybrid-Electric-Vehicle-to-Be-Unveiled.html
http://media.gm.com/media/cn/en/gm/...6/April/0407_All-New-Buick-LaCrosse-Hybrid-Electric-Vehicle-to-Be-Unveiled.html