Sigh. Model's wrong, which is becoming fairly typical for FFG lately. The front of the engines are supposed to be open, like intakes. See here:
Edit: Hopefully it's just the 3D model that's wrong, not the final sculpt.
It's the grey they used for the render. There is a slight color change that makes it look like the front is hollow, and the artwork on the cards (well 3 of them, not Sabine) show the correct front.