I would think in the background, this is just MIDI triggering some samples (with accompanying fancy screen re-draws). I could be wrong of course and it could be, oh wait a minute, just like Steinberg’s GrooveAgent 3…! Real audio parts played, with a ‘complexity’ slider, fills, more/less hi-hat/toms etc, and a load of different styles (drummers…!) and kits to choose (mix-n-match)…!
But, they don’t have a percussion agent to go with it… 
Also, no-ones yet pointed out that this is all 64bit ONLY - no more 32bit plugs allowed (no bridging facility). Interesting times…