That could be. My 15 million figure came from elsewhere in the demo, when he subdivided Zack Petroc’s “Super Average Man” model and was adding pore-level details with Projection Master.
I think they hinted that it was a height map, along the lines of what Unreal 3 is doing. Which is fine – whatever cheats they have to go through behind the scenes, if they have to stop subdividing and merely let you edit the maps directly… it still works. And the interface was pretty seamless – he didn’t put away his modelling tools and switch to a bumpmap-painting material to paint a limited set of values onto, y’know?
In any event, we don’t have video footage to scrutinize for details yet, so I’m only speculating. And taking their word that the program does what they claim. (being the 15 million figure, not the height map – I may have made that part up)
Remember, we’re limited mostly by the size of our displacement map. Increasing that limit should be a much smaller accomplishment than, say, letting us re-topologize our models or pose them with ZSpheres. 