Derek put together a neat tech demo for what's possible in the Unity engine. It's a concept video demonstrating what a Concordia TrainSim game might look like. The original plan was to make the project playable with a few waves of incoming enemies. There was even a goal for Oculus Rift support at one point, although this type of development is currently on hold. What has been done here looks really slick though! Hopefully the project continues to be refined so pilots can take it for a spin.
I'm working on a Wing Commander fan game using Unity as a robust 3D engine. With an eye to the future, and not being able to wait for Star Citizen, I wanted to create what amounts to what the original Training Sim was like.
I have the rudimentary pieces in: I added a Dralthi ship as my first enemy type, and I'm working on the AI to just destroy asteroids for now. Flight AI is something I'm new at, and seems to have a decent difficulty curve.