I think Whisenhunt and Grimm know a lot about Big Ben.
Enough to fear what he can do, but they probably know his short comings too.
In Whis' first year the Cards played the Steelers and Ben had a pretty special game.
His most memorable turnover was from a INT by Wilson on a ill-advised pass to Heath. Even when the down and distance seemed impossible Ben converted, keeping the play alive with his legs and a big arm.
I think the Cards can get the ball from Ben a time or two, but I don't think that'll be the game by any means.
I'd bet the defense will play a modified version of the one they just played against McNabb. Keep him (in this case Ben) in the pocket and make him throw into coverage.
The question is, which defensive front will the Cards use?
They didn't fear the Eagle rushing game so there were a lot of 3 down-line sets.
The Steelers can run though, so you'll probably see heavier 4 man sets (ex. Smith/Watson/Robinson/Dockett) with the ends tasked on keeping Ben inside and taking up blockers vs the rush.
I wonder if Ben faces the zone blitz often? I know his D plays one, but scout D usually plays a mock of that week's opponents...
Dropping Docket/Berry/Okeafor into coverage from a 3-point may mess with his mind.
The defense needs to be ready to play to the whistle though, because some of Ben's plays will be a lot longer then 5-6 seconds.