Well, Krennic is definitely talking to Vader at some point in the trailer (see second picture) and it would be weird if he didn’t talk back.

Also, judging by the three shots with Vader in them it does seem like he’ll appear in at least two different scenes, perhaps even three (although the last two pictures could easily be from the same scene/set.)

I’m guessing this is a statue of a Jedi on Jedha, which makes sense.

Here’s some ruins on Jedha as the DS fires on it (as we saw in the previous trailer), and I’m assuming that these are also Jedi related.