I just pre-purchased this on Steam after watching every single Sean Murray demonstration. I'm either going to play it for 10 minutes and realize I wasted $60, or I'm going to be playing it for 12 hours a day for the first few days. Right now, I feel like it's likely to be the latter.
For those of you who haven't heard of it it is a sci-fi exploration game in which all players exist in the same universe and explore planets and star systems. Players can name planets, creatures and plants that they are the first to discover. The game's lead designer, Sean Murray, has said that the universe is so huge that coming across a planet that another player has discovered will be very unlikely. Supposedly, there are 18,446,744,073,709,551,616 discoverable planets.