Well, if the Empire might have a presence, not a shock the Rebels might (though I'm not sure of the timeline and thus if the Rebels are formed yet).
Confirmed by Disney as a fake.First promo image:
"I remember going on set one of the first times, he was like, 'Yeah, I want to follow you onto the Millennium Falcon and do this thing.' I was like, 'I don't think I've ever seen the outside go into the inside.' He's like, 'Yeah, no one's ever done that shot.' As a fan I was like yeah, I was really excited. I know there's been a lot of talk in the press about this movie but for me anyway, it was a dream and also it looks really cool to me."
"Not a lot at all, at least not for me. I think we've all never been faced with anything like that and I think he did a good job of coming and tell us he didn't want to change what we were doing at all. He wanted us to remain confident in our vision. He just wanted to sculpt it in a way."