Damn, it looked like a significant improvement, especially in the weight department. The XM-8 was derived from the G36 family, so there are alot of similarities. At least H&K decided to continue with it as a private venture, hopefully someone makes use of it, quite a nice gun to go to waste.
With regards to the talon, Northrop actually patented a FSW swing wing design that looks almost exactly the same. It may not have engines from the space shuttle or such a futuristic computer like the (lame) movie, but its something.
That model mig-37 feret would never be used as an actual design. Even if it would fly well, they'd never make a real plane based off an american designed model airplane.
It's a shame, when WWIII arrives, we're going to be left in the same unprepared state as we were for WWII. At least we have the F-22.