We See Luke Looking through his Binoculars on Tattoine (This replaces the opening shot of Star Wars 77)
Suggested ending on Luke with the deleted scenes a few pages back. Feel it makes more thematic sense and also creates a nice parallel with Force Awakens also concluding with Luke.
I guess it depends on your intended viewing order really. If you were imagining ROGUE ONE as a film to be viewed post-ANH then LUKE might make sense (just as another cameo). You could even have R2 on the Tantive IV tuning in on a computer terminal and accidentally picking up the plans as they were being transmitted to the main Rebel ship.
Personally I’d prefer to think of ROGUE ONE as pre-ANH viewing, so would cut back on the cameos and obvious references, let ROGUE ONE tell its own story.