Since the recent patch there have been rumors flying around the net, about a supposed duping exploit, along with a rollback. Here is what Aeus from the european boards had to say about the rumors :

We appreciate and share players' concerns about a possible dupe exploit, and we're continuing to investigate the matter thoroughly.
However, at this time, we do not show any legitimate evidence of duping currently taking place or having taken place for as far back as we've checked.
Should any actual duping methods be confirmed, we will take the appropriate action in regard to the game and to any characters and accounts found to have been used with such an exploit.

Concerning a possible rollback: This is just a rumour!