One of the things that really stands out to me in the trailer is how amazing this shot of the Star Destroyer looks.

It looks so much like the miniature ships from the OT, however I can’t find any reason to rationalize this effect as being anything other than CGI.
It could of course just have to do with the resolution of the trailer, and maybe when I see it on the big screen it’ll look more like the CG ships in TFA, but maybe they’ve done something somewhat different. This is really just a wild speculation (based off one shot at that), but maybe they’ve done something similar to what was done in Star Trek: Insurrection, where they photographed the miniature of the Enterprise from the previous film and then made a 3D CG model out of those photos to make it look more convincing. Maybe they’ve done something similar with one of the old Star Destroyer miniatures?
Or maybe it’s just an exceptionally good CG shot, I just thought it look strangely better than the AT-AT’s in the trailer, as well as all of the spaceships in TFA (both the film and trailers).