Looked really good. Now I'm sure they're drawing on 2s or even 3s. Glad they are, really lets them push the art direction of each individual frame.
Just because CGI gives you the ability to draw on 1s doesn't mean you have to in every case. It depends on the type and style of the movie. And in this, an old stop motion-ish feel works really well.
If I had one problem with the trailer it's that Spider Gwen appeared a little to abruptly. I'm sure it doesn't happen like that in the movie and trailers have to fit a lot in but still. Everything else was top notch though.