As great as Rogue One is as far as outside-Star Wars saga movies go, there are still a handful of critics who are wary of how the teaser trailer and the final cut were so different.
Apart from the fact that you can never really rely on trailers to give you the exact feel of the movie, there are several considerations that directors have to take when it comes to the final roll. And for Gareth Edwards, he shared to Slash Film that it was in trying to make sure that you get to show the cool things without overstaying your welcome.
"In cutting the film, it just felt too long. We had to find ways to compress the third act, which was quite long as it was. And one real, fast, brutal solution was to put the tower in the base, so they don't have to run across the beach and do all of that stuff to get there. That became a decision that eliminated the shots you see in the trailer of the back of Cassian and Jyn and the AT-ATs."
In other words, the cutting had to happen to compress the action, nothing more. Edwards had felt that the movie may have gone to the point wherein the moviegoers would start looking at their watch because the action is no longer commensurate with the time spent in the cinema.
When they were watching the movie again, he shares that this is what he had felt, something that he didn't want the audience to feel when they finally get to see Rogue One.
As such, it's also the reason why there may not be any deleted scenes when the Blu-ray comes out. Edwards' finally say in the matter is that there doesn't seem to be any plans for these alternate endings to be shown at all. Not that we need an alternate ending—personally, that last scene proved to be more poignant knowing what was sacrificed in the end to have a spark of hope.
Rogue One will hit home release come April.