Apparently there's been some confusion over the exact way that the new arena ratings changes work. Bornakk tried to clarify that a bit today.

As he tells it, The adjustment to a team rating will always be based on the other team's team rating, but the adjustment to the personal rating of everyone in the match will be based on the average person rating for the other team. He used the following example:

Arena enthusiasts might be elated to hear that the personal ratings required to purchase weapons and shoulder pieces will remain for the current Season 3 items even as Season 4 will introduce new items into the game. According to Tharfor on the European PvP forums, in response to a question as to whether the ratings will be removed from items as soon as the new season starts, the ratings requirement will still exist (to purchase but not to use) the item but will likely be lowered. It's highly likely that Season 4 weapons and shoulder pieces will retain the 1850 and 2000 personal rating requirements. Exactly how much of a ratings reduction Season 3 will see remains to be seen.

This means that players saving up Arena points in the hopes of obtaining a Season 3 weapon or shoulder piece will still need to have competitive personal ratings in order to purchase the items. This is bad news for those hoping to obtain easy welfare epics, but good news for some players who might feel that their item values would diminish greatly if the rating requirements were removed completely. At any rate, it looks like Season 3 will last for a while, so there's still time to jack those ratings up. Good luck, everyone!