According to Road & Track...
....the Regal will be offered initially with a 2.4-liter 182-bhp Ecotec 4-cylinder paired with a 6-speed Hydra-Matic. A few months after its mid-2010 introduction, a turbocharged 220-bhp 2.0-liter Ecotec version fitted with an Aisin 6-speed automatic will be available.