https://www.youtube.com/watch?v=CIkdq7Zf4Zwwtf more advanced than I predicted
When it's running, it seems like about a fifth of it's strides has some minor airtime? I saw 2 strides where it wasn't touching the ground. So I guess they haven't solved that yet.
Also no big tests of stability (e.g. shifting body weight to scale large slopes, shifting gravel).