As writers Alex Kurtzman and Roberto Orci told us earlier this year, Shatner's appearance wasn't on the same scale as Leonard Nimoy's, but instead a recorded message that Nimoy's Spock would've presented to Zachary Quinto's younger version of the character at the end of the movie. TrekMovie has the complete text of Shatner's scenes, but here's a taste... including another Original Series cameo:
INT. CORRIDOR – CONTINUOUS
As Spock Prime walks off down the corridor, he passes
right by a man conferring with a nurse - the man pauses,
turns… it's SAREK. Suddenly overcome by a feeling that
the stranger who's just passed him is… oddly familiar.
I suppose I'd always imagined us…
outgrowing Starfleet together. Watching
life swing us into our Emeritus years…
INT. STARBASE ONE – HANGAR – ETERNAL NIGHT
MUSIC BUILDING - glass walls reveal THE ENTERPRISE at
dock, UTILITY CRAFTS floating around it, repairing.
Standing at attention in rows, THE ENTERPRISE CREW -
over four hundred of them wearing DRESS UNIFORMS - TRACK
DOWN the faces, all proud:
I look around at the new cadets now and
can't help thinking… has it really been
so long? Wasn't it only yesterday we
stepped onto the Enterprise as boys?
That I had to prove to the crew I
deserved command… and their respect?
And we STOP ON YOUNG KIRK. Composed, focused, proud. A
man. And to every fan's delight, finally wearing his
Go and read the whole thing, and see if you don't get slightly choked up at the end.