Rumor has it that you guys are all incredibly behind the times. The teaser poster has been out since this past summer. If you check Memory Alpha, Wikipedia, or StarTrek.com, you can quite easily see that there's plenty of information. It's TOS-era, with the launch of NCC-1701. First mission of Kirk's crew, although they're working Pike in somewhere.
* Eric Bana as Nero (the film's villain)
* John Cho as Hikaru Sulu
* Clifton Collins, Jr. as Ayel (cohort and general to Nero)
* Ben Cross as Sarek
* Bruce Greenwood as Christopher Pike
* Jeffery Hauser as unspecified role
* Chris Hemsworth as George Samuel Kirk, Sr.
* Sonita Henry as unspecified role
* Paul McGillion as unspecified role
* Jennifer Morrison as Winona Kirk
* Wednesday Mourning as unspecified role (featured extra)
* Rachel Nichols as an Orion
* Leonard Nimoy as older Spock
* Randy Pausch as unspecified cameo role
* Simon Pegg as Montgomery Scott
* Tyler Perry as Starfleet Academy superintendent
* Chris Pine as James Kirk
* Zachary Quinto as younger Spock
* Winona Ryder as Amanda Grayson
* Zoë Saldana as Uhura
* Karl Urban as Leonard McCoy
* Anton Yelchin as Pavel Chekov