I'm a little surprised that there hasn't been a reachout to the fanbase for PAX for a closed-doors session. I know that they did something with PAX East.
Game's way further now and probably at a point where such feedback isn't as directly valuable though.
I'm kind of assuming they're intending to ramp up unveils as they go through N7 day and Spring 2015, since the game should be entering full production at this point with the ramp down on Dragon Age: Inquisition, so they can also just get feedback from everyone pretty soon anyway.