Looks like a cross between a M and Volvo front end. Can't find engine HP specs but it's still a 3.7 and looks like they are rolling the M 3.5 Hybrid system into it which got 360hp and 0-60 in 5.3 for the heavy M.

 

Unfortunately, there are no changes to the engine. Perhaps in 2015. There are lots of pics and information on the G37 Sedan forum here under the thread labeled "2014 Sedan."

 

Ah .... sorry. The Hybrid system is nice though. I debated it when getting my M. From a pure gas cost I estimated it would take 7-8 years of driving the regular M vs the hybrid to make up the extra cost in gas usage.