Fantasy Flight Games has announced they’re going to be starting a rotation system for their Living Card Games.
From the post:
The Living Card Game model is all about growth and evolution. Now, having recognized the problems inherent within the natures of constantly expanding card pools, we are moving forward with the next stage in the growth of our LCGs. In order to ensure the continued health and success of our games, we are introducing a rotation policy for all of our competitive LCGs.