The reveal of the Falcon in TFA, with the musical queue that went with it, was one of the highlights of the film in terms of just a fitting moment.
And yes I think most of the cast of Rogue One are going to die in the film. Not all to Darth Vader, but some. I figure this because of what we see him doing in Star Wars back in 1977. He's chasing down Princess Leia to recover the plans of the Death Star, but he seems more interested in finding the Rebel's secret base, ad feels Leia is his only link to the Rebels. If any of the Rogue One team was alive, they would either have the plans to take back to Yavin, or have been captured and be tortured by Vader to find the Rebels hidden fortress. So, logic suggest that they died. Also Vader seemed that pissed off when he boarded Leia's ship. Like it has been a rough day so far, and now he has to deal with this Senator's daughter.