exploration. we are supposed to have over 100 systems at launch, exact number unknown as some are not discovered yet. all planets are done with the procedural artistry shown in the above video. they say we will have things like solid diamond planets to jet black gas giants. we will not lack for things to look at and explore.
politics and war. there are 5 alien factions, earth, Vaanduul, Banu, Xi'an, and Tevarin. all the aliens are AI,for now, so the only PvP you will see will be in the earth forces, Organizations (guilds), outlaws and other player vs player behavior.
we will have player made bases and habitats on planets, complete with defensive weapons.
they are working on procedural cities at the moment, so 3.0 is still going to have us restricted to the planet Crusader, and only the three moons will be able to be landed on. they are using the moons to develop the tech needed for the planets, that will all be at 1/10 scale.
so i guess it will be a game of acquisition, kind of like TDU2.