Gep Malakai wrote:
Looks like the saucer is about 1.5 to 2 times the length of the TransAm tower, which is itself 325 meters, or roughly the length of the Prime timeline Enterprise. That puts the saucer anywhere from 488 to 650 meters.
The nuEnterprise is, what, about the length of the Vengance's saucer? Even at 488 meters that's still bigger than the Prime version.

When Khan escapes the destroyed bridge, Sulu comments "He just jumped 30m!" I assume that's the size of the gap in the primary hull. Using the new Hot Wheels images as a comparison, Vengeance's saucer would be about 450m across, and the bowtostern would be almost 700m (800m from bow to end of nacelles).