Speculation: New MacPro Case?

Steve Jobs can't just talk about the new iMac for an hour (we hope). The new Mac-not-so-Mini won't be a surprise but at the same time is not really expected. It's a "Mac only" event so why not introduce a new case for the MacPro that is grossly outdated? The current MacPro cases are big and bulky for no apparent reason. Let's push the boat out and speculate that on Tuesday Apple is going to give us much, much more than an new iMac...