Star citizen promises to be an immersive, massive online space fighter simulator in the same vein as Wing Commander, with trading options like elite.
Chris Roberts wanted to prove that a PC only space sim (which we haven't seen for a long time) could still be commercial, and it looks like he's done it.
The biggest boost to the fundraising exercise so far has been when artwork for the (currently) largest ship that a player can fly was released, offering space for friends to play with either one of the gun turrets, or an additional fighter that is sat on the ships flight deck. This seemed to almost double the rate of submissions.
Supporters have been promised access to an alpha including dogfights in 12 months, and play on a later released beta with the full game slated for release in 2 years time.
Star Citizen is funded from their own website and kickstarter where you can pledge as much as you like, the more you spend the more rewards you get, with copies of the game coming in from $30.