- No pop-up flash -> FF
- Dual card slot -> high end camera
- New designed buttons -> they received good comments from 7D users
- 16:9 screen -> video oriented
- rate button -> video oriented could be 24 fps, 30, 60 etc (blue buttons might mean 'not taking pictures', so it could mean like we all know it's 'playback mode', or possible 'video mode' as well. It might also be for photography then if the shooter might want to take a picture, then it would be the choice between e.g. 3fps, 5 fps, 7 fps
- the guy was on safari with already announced/assumed to be announced gear (1Dx, 200-400), so they also gave him the video DSLR prototype, to test video, but also to check the photo capabilities. This makes me think this isn't a prototype tester, but a 'soon to be announced' - product tester
My guess: this is the high end video oriented DSLR