Of course some MMO's do rollbacks, and of course it's possible to do with HeroEngine. (Anybody with any database familiarity would snort at the idea that it wasn't possible.)
This MMO, however, never will.
The official word was that people who abused the system yesterday will be investigated and appropriate action will be determined. This, as we've come to discover, means that nothing will happen, but devs will disagree that this means that nothing will happen.