Its gotta be a promo, because I was pretty sure the Tantive didn't show up until after the final duel.
What I really liked about the shots was that second Tantive one with Ben, Yoda, and Bail. Seeing more sections of the ship, like that meeting room, just adds lots more subtle detail to the proceedings. Now, when I watch Ep4, I'll know that critical decisions were made just behind some door.
Seeing this set, and thinking about a comment made some time ago about Bail switching from his senatorial robes to a more "common" attire makes me wonder if we'll see OT-style costumes on board the Tantive, like Fleet Troopers or something, and Bail in a similar vest deal thingy.