As strange as it might sound, Tyler Perry, famous for all those Madea movies, has been cast in - and already filmed his scenes for - the Trek movie.
The scenes were shot in the Long Beach City Council Chamber (you can see a picture of the space here - it really does look like a Trek set, even without set dressing). Extremely minor spoiler after the jump.
Evidently Perry plays a member of the Starfleet top brass who sits on a tribunal overseeing Cadet Kirk's "punishment" for cheating on the Kobayshi Maru. Of course, I'm using the quote marks because Kirk actually got a commendation for original thinking instead of getting busted back to janitor.
So let's have a scorecard for the casting, because I've lost track.
Other Notable TOS Characters:
Leonard Nimoy - Older Spock
Bruce Greenwood - Captain Christopher Pike
Winona Ryder - Amanda Grayson (Spock's mother)
Ben Cross - Ambassador Sarek - (Spock's father)
Chris Hemsworth - George Samuel Kirk Sr.
Jennifer Morrison - Winona Kirk (That Kirk's mother's name was Winona has always been fanon ... up till now. Good job, Abrams.)