David himself said it's MMO in several interviews around E3. They aren't exactly consistent with terminology themselves.
Please people, enough of this endless cycle. FD will give us tools to try out social aspects of the game. Test them and provide feedback here. Before that this is fruitless and a little bit saddening.
I've definitely heard DBOBE talk about "MMO type aspects" of the game in various E3 interviews. I suspect he had to do this to deflect some of the obvious and unintentional attempts to pigeon hole the game by uninformed, uninterested and otherwise agenda fueled interviewers. However, I have never have I seen him or any other FD employee describe ED as an MMO either officially or off the record. They've only ever used the terms 'open world' and 'multiplayer' to my best knowledge.