I just watched a video where FFG reps announced the new format based rules. So they are going to cycle out older sets as they release new ones.
I am sure this was bound to happen the more they release cards, however, I just got into the game about 5 months ago, and only get to play monthly if I am lucky. I have spent $350 on this game so far and have about 90% of what is currently available, and now half of what I purchased will cycle out of play in 2016. That's disappointing. Hope they have "legacy" formats where everything released is legal.