Hackers / modders have managed to modify Battlefield 3 beta servers to allow multiplayer battles between 128 players on the Operation Metro map. Problem is, those servers appear undifferentiated on the official Battlelog and players who join them risk losing access to all their EA Origin games.
We have no way of confirming this, but the screenshot accompanying this post is alleged to have been taken from the official EA forums before the post was removed. In the post, a Dice employee warned Battlefield 3 beta players that although the only way to distinguish "hacked" servers from official ones is by noting the maximum number of players which is 128 instead of 32, players who join those servers might have their accounts banned and hence lose access to all their EA games.