http://gamerzone.avermedia.com/game_capture/extremecap_u3
The gameplay capture field has been advancing fast. Looks like this literally just came out this month. You'll have to tether it to a laptop or desktop with USB 3, but this is the first capture device that can do full HD at 60fps recording and uncompressed to boot.
You can record with the supplied software at a max bitrate of 30 mbs in MP4 or use FRAPS or another program to get uncompressed 4:2:2 recording. Amazing that the first capture device to do 60fps at full HD would be designed for video game capture and costs $180. Wow.