The F12 eject key was the ONE thing I hated about 10.1. If you use any application that uses the F12 key (like Dreamweaver or Lightwave), then you were essentially screwed with 10.1 - 10.1.1.
I for one am glad they put it back, but they should have an option for people with older keyboards to be able to activiate it. Maybe there is now, I haven't looked...