From SchmoesKnow:
Sure, you can take this with a grain of salt; you can speculate till the Bantha’s come home but according to a “trusted source” close to Schmoes Know’s very own Kristian Harloff, the December 18th release of Star Wars Episode VII The Force Awakens will see the end credits tease a small clip and teaser for Rogue One (A Star Wars story). Detail are scarce at the moment so I would file this more in the “rumor” category than a scoop or exclusive.
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Wouldn't be surprised. I said last year they'd likely have a Rogue One trailer or something attached to TFA, but I wouldn't have guessed a post-credits thing.
Well it is the in vogue thing, especially with Disney's multi-film projects. I do feel it'd be a bit out of place though with how the films traditionally are formatted though.