The current ladder is just for test, as we are trying for change it to PVP points which for each of those who has participated and they could buy items/clothes/etc., from PVP shop which are only available to players who have battled in the ranked ladder.
This might not be the exact plan as I have described it, but we are working on ranked PVP rewards and the ladder itself. We are just a bit busy dealing with Hoenn and some other stuff but rest assured, we are working hard to improve every aspect of the game :)