At the front of the crossover, we can clearly see it has the skinny, scowling headlights of the concept sitting high on the front fascia and flush with the hood. The main grille looks like it may be smaller, but it could also just be that the actual open section of the grille doesn't fill up the grille area of the fascia. In profile, the crossover has an attractive long nose, low roof and rising belt line. The rear shows the most change, as the rear pillars are much thicker, and the taillights don't appear to span the full width of the crossover.
It's in the rear that we can also see the evidence that the Buick Enspire will actually be gasoline powered. Looking very closely under the rear bumper cover, we can see two exhaust tips turned to face the ground. Based on the size of the crossover, and the fact a Cadillac XT4 was being driven along with the prototype, the Enspire is probably using the XT4's platform, as well as its mechanical bits. That means it probably has a turbocharged 2.0-liter four-cylinder making 237 horsepower and 258 pound-feet of torque. Power will also probably go through a nine-speed automatic to either the front wheels or all four.
This prototype looks to be pretty far along, so we'll probably see the production version in about a year. Considering the Enspire's size and likely powertrain, it may even replace the similar Buick Envision. And since the Envision is Buick's worst selling crossover (unless you count the Regal TourX as one), it would be ripe for replacement.