I just received this email from no-reply@upgrade.blackberry.com:

Bundle An upgrade of BlackBerry® Device Software version 4.7 is available. This upgrade includes optimizations and enhancements approved by your wireless service provider.

Note: If your device is associated with an email account that uses a BlackBerry® Enterprise Server, contact your administrator for more information about upgrading. is available for your device.

Go to http://www.blackberry.com/go/softwareupgrades to upgrade. 

If you're a Storm owner and have opted in to receive notifications on OS updates (option you check off in Desktop Manager), expect to see one of these emails in your inbox. You'll want to follow the forum discussion and comments on this one though folks, as while this notification was sent out which seems to indicate an OS update is available for the Storm it doesn't quite seem to actually be available (and shouldn't this long-awaited update be coming via OTA?!). Word in the forums seems to indicate that Verizon's update is coming on the 8th. No worries though - you can always grab the leaked version of OS4.7.0.75 if you can't wait. You can watch for Storm updates at the Worldwide Storm Update Site or at Verizon's BlackBerry Software Site.