Hopefully they'll avoid Kirk/Carol, if we saw Carol in her undies in STID then I shudder to think what they will show in the next film.
On a different note everyone here is saying this is a trilogy and thus the third film is the last JJ universe film. Personally I don't think we should set our sights on a trilogy. If the third film does as well as the other two then we're going to get a fourth film and perhaps even a fifth. Heck, the third film could even be the beginnings of a proper trilogy. They could shoot a back-to-back trilogy over a one year period if they're feeling really ambitious.