Haven't watched the movie yet, and it looks like I won't be able to for the next little while...
Spoiler or not, I would not be surprised either way whether the Rogue One team survives or not. I think the story can easily be shaped either way, and the only definitive thing everybody knows is that their mission was a success in the sense that the stole the Death Star plans, and successfully delivered it to the Rebel Alliance.
Sigh... how long did it take the Force Awakens to come out on DVD / Blu Ray?