I heard they are planning on making your team have a minmum rating of 1800-1900 or so for the season 3 rewards.
So i thought of a quick work around..... if your team sucks and you only have 1500 rating or something you can still get the arena points to buy the item. Then when you have enough arena points for whatever item. just have a friend invite you too a higher rated team.... buy your item, and leave the team.
Boom you got around the 1800-1900 rating requirement.