Chris Magno published on the LEGO Technic forum at LUGNET, a curious finding on the properties of a SYSTEM part. Probably not much useful but still quite interesting!
The fact is that grooves on the new 'Brick Round, 2x2 with Grille' (part 92947) inter mesh each other and because these bricks have also an axle-hole, they can be used as a gear once properly positioned at the right spacing into a Technic grid.
Later, Philo also suggested that part 'Brick 1x2 with Grille' (2877) may also mesh and work as a gear rack...
Please find what this is all about, from the picture and video below.
Another nice feature is that the transversal grille on the "backside" of the brick can be used as a grooved runner.
Guess this might turn not very useful and definitely not much powerful in terms of the supported torque, but still may have some use on compact models requiring reduced backslash and torque!?
To see if it will ever come into use at MOC.