I hope you've recognized the question mark at the end of this post's title! A recent post on Dev Team's blog says

"... but be prepared for some stuff from us today that is cool."

So very likely will we see an updated version of PwnageTool that handles iTunes 8.0 modified ISPW detection AND firmware 2.1. I'll keep you posted and - as always - will walk you through the process of upgrading while I'm updating my devices.