Well, I will round up, what was able to see in the media available on the www:
* You will be able to craft your bases, ships and so on like it was possible in Space Engineers
* You will be able to land on planets and travel between them
* You will be able to do PvP and PvP in space
* You will be able to explore space
My question would be, how the whole concept is planned. Will all players have to start up economy by their own or will in the early game stages npc merchants seed items to the universe? Is there any idea how production and trading will work? Are there plans for mining, salvaging, etc.? Will the planets, systems, ... be able to claim by players? Or will players only be able to keep others out of their space while having active militia online? Will there be space for n00bs who want to get the basics of the game, where they are not easy victims for the hunters? Will there be any kind of PvE? How could that look like? Is a strong community and options of an game API usage for fan projects wanted or do you want to keep most tools by your own?
I know, you are currently in pre-alpha phase. So most of these won't be final concepts. But I would be interested in the direction DU is pointing? This would maybe help for us to discuss ideas of better or worse solutions you could get as feedback...