The details are fairly light, but it seems as though NASA is building a VR game on space exploration (remember Microsoft's Space Simulator, or the free and open-source Orbiter?). I wonder why NASA is rebuilding their own engine rather then picking up and using existing simulators (like Open-SESSAME) on top of the Unreal graphics/physics engine.
I also wonder if, given their presentation venue in SL, if they are considering integration of their space simulator with SecondLife itself. Apparently right now it is possible in SL to have some sort of orbital platform. But imagine if they actually opened up Space Stations, or other planets/moons for exploration/colonization.