I really hope that poster is fake. If there is going to be a DS3 then I'm going to puke!
Having the red lightsaber blade parallel to Rey's staff is really confusing to the eye, and should be something that a professional artist would not do. That should indicate that it is a fake.
However... I thought that the shots of the Ep3 Emperor's awful makeup were fake, and that Hayden inserted into ROTJ was fake, so I might be wrong.
Edit: Awww.. Goddamnit!