I think it would be cool to have plant life in distant star systems. they could be like the movie avatar. another thing that would be cool if there is fish life under massive sheets of ice but you cant get to the fish you can only see there shadows under the ice. But I think they will have to be in distant star systems. it would make some endgame goal for players. as well as making the game ten times more exciting. as the fish life could be unreachable so no hard graphics. and as for the plant life it has basically been done it in breaking ground DLC with the researchable rock.