I do think this D knows that, at least 'round Pittsburgh, their greatness will be measured by their SB performance. All the regular season accomplishments, of which there are many, won't mean much if they come up short in the big game. To even be in the conversation of the greatest defenses(especially Steeler D's), you better have a ring. Hopefully we will see a defensive performance that will culminate a season of uncompromising excellence and elevate this defense into truly rarefied air.
I second that. I expect the Steelers to try to create ways of bringing mostly 4 pass rushers in ways that Warner and the Cards don't expect. A lot of classic zone blitz stuff, especially the kinds of switches that punish receivers coming across the short middle.
The Cards love to throw to Fitzgerald coming across the short middle - his first TD was an example of this. The Eagles failed to bump him at the line effectively and they couldn't contain those crossing routes.
I think the Steelers will focus specifically on taking that away. I expect a few Lawrence Timmons decleaters on Fitz/Bolden/Breaston coming across like that. They will get their completions every now and then - but the Steelers will make the deep stuff very hard to complete and the short stuff in front of Warner really hard on him and the receivers.
Basically, though, how hard the Cardinals make the Steelers work to pressure Warner will be the key factor that determines whether the Cardinals make it a close game. If the Steelers have to consistently rush more guys than they want to, the Cards will hit some big plays downfield. If the Steelers can pressure with 4-man rushes, this will be a blowout of huge proportions.