I just got my mac mini yesterday and I was trying to do app updates and iPhoto said it needed 10.8.2 to update and then I went to check for update and it said there was no updates available. Do you know whats wrong?
To answer the OP question. Apple pulled the 10.8.2 update for the mini (both through software update and standalone) last week for some as yet unspecified reason.
Other people that have contacted Apple have been told that Apple will be posting a new version next week.
Downloaded and ran the update. Upon reboot, there was some strange behavior where the OS asked repeatedly for apple ID and password for iMessage and FaceTime. I guess this is the keychain issue I've seen mentioned. I canceled out of that and downloaded the supplemental update to 10.8.2 via Software Update.
All seems to be good. I recommend doing this if you're out of patience.