To begin with, the headlights and front fascia are different. There's more overall intake area upfront, with lower side vents and a much bigger grille opening. The headlights are rounder than the DB11s, and to this author's eyes more classic and attractive. The hood extractor vents are in a different place, large quadrangles instead of the DB11's long, narrow slits – although this could easily change for production, as this arrangement might only be for the mule. Moving to the side, the sills are wider and the wheels are larger, likely an inch greater diameter than the DB11's judging by the reduced sidewall. The car is also noticeably lower. Out back, the most obvious difference is the quad pipes. They nestle above a more aggressive rear diffuser.
So far, all this looks to be production-possible. Certainly the Vanquish will be positioned as a more aggressive, powerful version of the DB11, to which it's related. While the specific shapes may be tweaked slightly, everything we're seeing looks to communicate the Vanquish's mission effectively, and nothing looks unrenderable in metal or composite. Long story short: This looks like a nearly finalized exterior design.
Note that this isn't related to the Vanquish Zagato Volante we saw earlier this year. That car is a final hurrah for the old, VH-architecture Vanquish.
We expect the Vanquish to have more than the DB11's impressive 600 horsepower, so it can do battle with competitors from Ferrari like the 812 Superfast.