Much of the focus is on the sci-fi sandbox title's space stations. The dev team at Frontier is keen on variation, of course, so Elite "will be using procedural algorithms to to construct stations out of a range of modular assets." This approach will also allow players to see stations change over time "in response to player-driven events." There are also plans for game-driven station construction via the event system, which would generate missions for players, "allowing you to help or hinder the progress of a station."
Frontier currently has plans for different station types (mining bases, shipyards, pirate bases, etc.), as well as numerous sub-modules that make up each type. There's a lot more to the letter, so be sure and give it a read via the links below.