https://www.google.co.uk/search?q=me...D4eu0QXrsICQDw
http://carscoop.blogspot.co.uk/2012/...forces-to.html
There's a wide range of articles. The only confirmed engine as of now is a four cylinder turbo.
I would love to see 400 hp as well but my assumption would be that if we got this engine the power and torque would be slightly higher in a chassis that weighs maybe 50-100lbs lighter.