I think this is quite interesting.

http://www.cinemablend.com/news/1605650/how-star-wars-rogue-one-could-have-played-out-very-differently-according-to-ben-mendelsohn

Ben Mendelson does not go into any detail but says there were around 20 - 30 scenes that could have played out totally differently going by some of the things we have seen and not seen I’d say that it rings true.

I just had the Ultimate Visual guide delivered today It’s actually quite a god book. I have only been flicking through it. One of the interesting things that has grabbed my attention is some sort of cutting tool that the storm troopers would have been using to try and get to Jyn and Cassian in the Vault.

There is definitely a few bones and tidbits of info in it alluding to things we did not get to see. As others have stated a lot of made up stuff in there in terms of story.

I definitely like the Land speeder for the Galen Family on Lahmu called the Family Clunker raised an eyebrow. Something again that must have taken ages not only to design but also to build. Can’t remember seeing a land speeder

So much cool stuff that unfortunately we did not see in the film. My mind seriously boggles about it.

These guys are not covered in the slightest though, I have a feeling they might be have been commandeered and used in another film?