it actually looks like a new spin on the
harmonic drive, an idea that dates back to the 60s, at least, and was used on an experamental V/STOL aircraft desiganted the (i think) V-60
instead of using a flexible gear, they used rollers that are linked together. because of size (of the rollers), i don't think that it will be able to produce gear ratios nearly as large as those made in a conventional harmonic drive.