They DID say that the world heals after you beat it up, they said that with people destroying things all the time it would have to heal so that suggests its open world destruction.This is actually what I'm waiting to see...even the term MMO is suspect, really. We don't know what that means. People refer to LoL as an MMO, even. So for all we know, all that destructible stuff happens within a shard of the world, and you rejoin the main world when heading back to town or some crap. I hope it's not the case, but until they actually get deeper into the mechanics of things, it's hard to even understand what we are looking at.