Scarbs has had a chance to see the draft regulations for 2012 and made an overview of what would still be possible with exhausts next year.
http://scarbsf1.wordpress.com/2011/10/2 ... n-effects/
Personally I don't see how teams can differentiate a lot in this area, except for focusing on the exhaust direction, especially deciding whether to flow towards the centre of the car of towards the rear tyres.
I'm quite disappointed to see that on top of the exhaust exit positions, a limitation in angle of the exits.