Guessed it, the trailer was awful... Although from my understanding (and if this is true, I will be rather pissed off), the reason they are doing re-shoots is because the disney executives believed that rogue one was too dark and after the recent 'success' of BvS (which seems ridiculous as I personally thought thats about the only thing this movie got right, I didnt think the movie being too dark was one of its issues), they opted to make changes. If this were the case, Id be pissed because I really want to see another dark SW movie similar to ROTS.
Some of the rumours I have heard and seen surrounding this movie were really intriguing. But sadly, my guess is that most of these rumours I have heard are probably the things that will be changed