Looks promising; hopefully he'll tackle the toolbar mess stealing so much vertical space next - or at least make them usable vertically on the Mac (and anywhere else they're broken) or provide some way to save vertical space (ribbons!!*)
Weird that he's kept with the visual studio style titlebar/tool palette metaphor, but they do provide the shade functionality and can at least be disabled. Also weird that you need to resize the whole (catia-like) tree width instead of the child items simply being only as wide as they need to be! Vertical tabs would make more sense for vertically stacked palette - hopefully these points are all readily apparent to the dev and we'll see them soon enough.
"You can build really awesome interfaces" - I hope he includes a default setup; I don't really want to build an interface when I use a cad software! With sensible defaults I don't see why this wouldn't replace the current ui.
Steve, where's the source link for this video? Was it a blog/forum post?
*a ribbon-like idea would work quite well as top level menu entries on the right hand side (would need a certain width window) used to show single toolbars as required (maybe by mouse over rather than explicit "hoover" or click-selecting).
Jamie