I know you’re incredibly excited for Apple’s “Let’s Rock” Announcement tomorrow, but remember, you can’t update your firmware through iTunes if you want to keep your unlock status.
Resist that urge! Say, “NO!” to that update tomorrow. It won’t be long before a jailbroken release is available, and I’ll be sure to let you know when it is.
As a side note, Cydia Installer update 1.0.3 is available in Cydia today if you want to go get that. Maybe that will satiate your updating needs.