The new October cover of Empire shows us the First Order hanger with Phasma, Kylo, and Hux:
The next reveal will be on Sunday.
Interestingly, this image is almost exactly the same as some concept art described here. The only difference was it featured Darth Vader standing in for Kylo and he had his back to us without Phasma and General Hux. Even the Original Trilogy Stormtroopers are the same (noticed by J-Red5).
Update: The second cover is on Twitter with an Original Trilogy Falcon:
— CloneWeb (@cloneweb) August 21, 2015
Update: I asked Empire about the Stormtroopers:
Didn’t think that one would get past you! All I can say about that is that the image was provided in its current form by Lucasfilm, after having been approved by the filmmakers.
So there you have it!