Paramount have set a test to Star Trek audiences to find a cameo from Star Wars droid R2D2 in the new film. The viewer(s) who find R2 will win a custom prop from the film itself.
This is what Paramount had to say.
"There’s really not much more to tell you. The rules are pretty simple. Locate R2, write down where you saw him in an e-mail, and shoot it off to facebook@paramount.com with “STAR TREK Easter Egg Sweepstakes” in the subject line."
So go back and get looking you lot!