Apple has released an EFI update for the Mac Pro.
“This EFI Firmware Update fixes several Boot Camp and start up issues on Mac Pro computers. If the firmware update doesn’t run automatically, open it manually in the /Applications/Utilities folder.”
Apple has also released an SMC Firmware update.
“The SMC Firmware Update adjusts fan behavior in the Mac Pro. After this update has completed successfully, your SMC Version will be: 1.7f8. The updater application will be installed in the /Applications/Utilities folder and will launch automatically after restart.”
So Mac Pro users, check your Software Update program for the latest updates (Apple Menu > Software Update…).