Schmoes Know claim that The Force Awakens end credits will contain “a small clip and teaser” for Rogue One. And to their credit, even they seem a bit doubtful.
Now, obviously, it’s not out of the question that The Force Awakens will carry a Rogue One teaser at all – hell, it’d be foolish if it didn’t. But in the end credits? That seems like a bad idea to me, period. You don’t want to distract the audience fresh off the first real Star Wars film in a decade – all those potential buyers of books and soundtracks and action figures – with a sideline movie that’s set on the other end of the timeline.
Do you give us a Rogue One teaser? Yes, of course. But you do it before the film, as is traditional.
The bantha in the room here is Marvel, who’ve undoubtedly made the credit scenes an expected thing. And I’m not against an end- or mid- credit scene for Star Wars at all – just that it needs to be relevant to both films in question. (Something regarding Episode VIII? Sure.) I find it probable that they may break tradition somehow, but a TFA/RO matchup simply doesn’t pass the smell test.