I think Rosicky should start on the left, not in the middle though. Having Nasri and Rosicky in the centre would leave us too vulnerable imo, they aren't physical enough.
Diaby's performance is quite crucial imo, if he has a mirror of the last performance, we're pretty much buggered, but he could turn the game around if he allows us to dominate midfield and give the ball to Nasri and Bendtner.
I'm glad that Wenger has lots of confidence in Nasri.