Well they do refer to the "new republic" and the "empire" in the description about the battle of Jakku. First cannon mention of the new republic, though it seems to not be existent in TFA so far.

Meaning that maybe both fell greatly, eventually causing the "resistance" and "the first order" to rise by TFA.

I'm guessing this game won't go into story allowing "Aftermath" to cover it, OR it could be an opening for TFA much like how Trek '09 started, with a battle taking many years before the present story takes place.