Pretty sure Rogue One: A Star Wars Story is just the working title.
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That's a pretty good trailer! I'm sure this will be very entertaining. My favorite part from the leaked script excerpt I read* was when the lead we see taking out, like, a whole platoon of Stormtroopers, Mary Sue (Felicity Jones), realizes she's Force adept for no reason at all and then chokes Darth Vader out (it's good they're keeping his appearance a surprise).
Trust me: That's going to look EPIC on the big screen.
*I'm curious to see how many people think this is serious.