One thing you'll quickly realize is that the majority of the people on the forums are here to desperately voice their opinion that Elite is not an MMO, will never be an MMO, and has no MMO-like qualities because it is against the very laws of nature and physics, because Mr. Braben whispered this to them in the shower.
That being said there will be no significant community experience within Elite: Dangerous. It's being catered to small groups of players mixing and interacting at random, and focusing on a feel that is truly like that of deep space, filled with an insignificant number of people. You will have hubs where people regularly trade and travel, but even the busiest hub will only have half the population of, say, any bank you set foot into in LOTRO or any other mid-level F2P. And these hubs will be clustered near the starting area, with a whole lot of empty everywhere else.
In short: It's multiplayer, it's massive, but it's not massively multiplayer. It'll make for a great online single player experience with the occasional player name showing up in comms once a week.
I don't really care one way or another, when I want player interaction I will find it, but typical MMO players are going to be very disappointed to find that they're essentially logging into an online account for a single player game.
Quoted for truth...