After careful observation of the video, I'm pretty sure the brushes are stationary.
So it's basically, spray water, spread water using the stationary brush, then suck up dirty water.
- iRobot omitted Stage 1 - light vacuuming floor prep
- iRobot omitted front wheel, so I guess the front brushes act as forward-tilt support
- Seems like a kind of water bag system was deployed to save physical space, such that clean water & dirty water are sharing same space
I find the R&D for this new Scooba is A LOT less than the original design. Probably more focus on speed, light weight & navigation.
No high speed rotating brush = less power consumption
Smaller profile = lighter = less power consumption
in return...
Faster movement to cover area maybe average >4 times, to compensate for the lack of rotating brush