I would argue that FFG has signed a confidentiality document stating that they cannot release any of the Ep VII IP until Sept 4. Additionally, I would argue that this document is signed by all manufacturers releasing anything under the EpVII license. Exceptions to this are Lego who have been able to officially release EpVII 2015 Lego kits prior to this date. I'm sure this was part of the contractual agreements between Disney and Lego though. Lego is a much larger organisation that FFG and brings license owners a lot more bank than FFG could dream of.
I expect that FFG is contractually obligated to A) maintain complete silence over the specifics of the Ep VII content until Sept 4 and B) If that silence is broken, do everything in their power to regain it.
What I find a little frustrating is that had FFG had posted a stickied thread explaining that the spread of these images could have legal ramifications on FFG, the issue would have died sooner .. and avoided the umpteen thousand similar threads being created with both leaks and requests not to post the images.