Why is this in the media area?
There is a sticky with all the known information on the 4series:
http://www.f30post.com/forums/showthread.php?t=522600
And the latest info was also posted in the 4 Series Coupe Concept thread:
http://www.f30post.com/forums/showthread.php?t=775876
No other information is available yet because the car has not been released yet. If information was available you can trust there will be a lot of information available on this site.