The biggest problem that FD has when it comes to raising awareness about ED is the scope of the game. To really understand what ED is the whole game pretty much needs to be finished.
A "normal" game can be shown off by much easier since the developers can finish off an "area" of the game and then use that to show the gameplay mechanics and what the game will be about. That particular area will be a pretty accurate representation of what you could expect from the rest of the game even if the rest of the game at that point is almost nonexistent.
Since the entire environment of ED is done procedurally this becomes much harder since there is no such "area" to show of. If you improve some aspect of how the stations will be generated ALL stations will update accordingly. The same thing applies to everything else in the game: Stars, nebulas, planets, asteroid belts and so on...this means that FD can keep on improving the game pretty much right up until release and then just hit the generate button to get the complete game environment generated. Ok, so that is oversimplifying it quite a bit, but the general idea still applies. They don't finish one "level/map" and then start on the next one. No, instead they build everything at the same time, but this also means that the "polish" on everything will come at the end. Up until that point everything will probably look rather bland and not really something you want to show to the public.
What they CAN show is the handcrafted assets because these can be polished earlier. This is why we have seen mostly ships in combat so far. Because the ships/weapons/FX are "finished" but the environment isn't.
The current alpha also follows this pattern. Except for the planet in the background everything else is handcrafted assets coupled with a prerendered skybox. I suspect that even the asteroids are placeholders at the moment because if you dig through the games folders you will find a folder called "Artist_Asteroids". Why call it "artist asteroids" and not just "asteroids"?
They probably want to let the galaxy/environments "cook" for as long as they can because all of it will look so much better the longer they work on it and therefore have a much better impact when we actually get to see it.
This is why we haven't seen for example the galaxy map or the stations in-game yet. Showing off things like docking, trading, missions, ship customizations and other station-based activities becomes rather difficult if you don't feel that the stations themselves are ready for public viewing, don't you think?
Having said that, I think we are closing in on the "big reveal" pretty soon and when that happens I expect FD to start marketing the game more aggressively since then they can actually show the complete picture.
