A one-hour presentation. Hmmm... I don't think this is necessarily likely, but it would be nice if they showed a bit of in-game footage like they did in private for interviewers during E3. I suspect that they would have to have a more complete build in order to do that, however. Some of the E3 interviewers mentioned that monsters weren't moving yet (since the game wasn't connected to servers) and the jumping animation had yet to be implemented. They would never show something like that in public, because people would misunderstand, assuming that the final game would be like that. Then we'd get all sorts of negative press from uninformed websites (which is hardly a new thing, but still).
So I suppose it's probably still too early for public in-game demonstrations, but I can still dream...