According to an Apple technical note posted on Wednesday, the automatic Software Update software that pushes updates to the masses may not display the EFI and SMC firmware updates released earlier this week. Users should check their version numbers and download the software manually, the document advised.
The page lists the current firmware versions for all Intel-based Macs, including the Mac mini.
The EFI Boot ROM and System Management Control firmware information for your Mac can be found in the About This Mac item under the Apple Menu. After clicking the More Info button, you will see the EFI and SMC versions in the main Hardware Overview tab.
Check out the Apple Downloads page if you're not current.
The recently released firmware updaters for the Aluminum Keyboard are also there, in case you didn't update them as well. It fixes an issue with unexpected repeats.