You may have noticed that for the past few days you could copy characters to the PTR. Well, Wryxian has acknowledged on the official European forums that wasn't intended since there are no PTRs active and there's no official date set for 3.1 testing.

We will be closing down the character copy service shortly and will delete all characters that were copied during this time. The character copy service will be enabled again once the PTRs are ready to go live.

So just to make it clear: The PTR for Patch 3.1 isn't active yet.