Yeah, I think she is an Imperial Officer.
In the old EU/Legacy stuff Biggs Darklighter was at the Imperial Acedemy. The same place that Luke wanted to go in ANH.
Well, at the Acedemy Biggs met a bunch of like minded, free thinking people, and when he got to his first duty station, a ship called the Rand Ecliptic, their was a mutiny on her. Most of the crew turned on the Imps, and joined the Rebellion.
So I'm wondering if they are going to use any of that for this movie. In ANH Luke says that Biggs went to the Acedemy, so I wonder if they are going to explain how he got to Yavin, if that is even him, which I'm sure it is. But I was sure that Jakku was a town on Tatoonie, not just another desert wasteland planet...
In some of the promo shots, you can see one guy who is crouching down, and he has the Imperial Cog on his shoulder as well. The back packs in that shot are the same ones from Hoth, just black, not white. So I think we are going to be seeing a lot of former Imps in this movie.
Remember that Mon Mothma is an Imperial Senator, and at the start of the movie the Imperial Senate is still together. I wonder if in the movie it will be disbanded, like they mention in ANH. Perhaps that is why she ran to Yavin?
Also, Jimmy Smitts as Bail Organa one last time!!!! Perhaps, him hugging Carrie Fishers daughter, and saying good luck Leia, see you soon as she boards a Corvette!!!