I think that the area was too small to show real-life behaviours, patterns, etc. At least, similar area are used in chain stores to demonstrate robot vacs and seller always tells me: "this area is too small to show how it really works in real environment [house]", so maybe...
Brushes are shorter and probably different design than VR9000's brushes, but what I think about are these two rubber blade & bristle "pet" brushes interchangable between certain VR7000's models as well as self cleaning brush cover with regular brush cover in VR7000's ? Still unknown. Also, there was not shown if the self-cleaning brush system consists only of special design rubber brush and "teethed" brush cover or something else inside brush module/under brush itself, not shown in the video? Must be confirmed.
It does not have brush installed so close to the wall which it follows in wall follow pattern, but it has strong suction. Not confirmed how it will act on wall-to-wall carpet. It is confirmed to better corner cleaning on hard floor than Neato Botvac
and Roomba (kelrobots tests on youtube shows the "results" of Neato Botvac
and Roomba on hard floor in corners).
Powerbot VR9000's brush drive has belt. See PM from me.