There's been a few post-E3 articles, getting snippets of what exactly it is you can do in the procedurely generated space adventure No Man's Sky. In this particular one from Kotaku, they ask how there can be such scope and depth from a team as small as Hello Games, and are shown by the team themselves how it is done. It's an interesting read.
How a Seemingly Impossible Game is Possible | Kotaku UK
Personally speaking, this answered some of the questions I had remaining about the game, and I've come out of reading it as excited for No Man's Sky as ever.