This evening, Apple released a firmware update for Thunderbolt-equipped Macs. The update, which is 486 KB, isn’t shipping with a lot of details:
[quote]This update provides Thunderbolt performance and stability fixes.[/quote]
After installing the update, the computer will restart and a gray screen will appear with a status bar. Apple warns that you shouldn’t shut off the computer until the update is complete.
The update can be found in Software Update.