There's going to be one: https://youtu.be/zjy_6lH3IxQ?t=5m11s
As said not 19" rack-able. :-( @ 5:30, ~ 800U is bit extreme perhaps.
Did some drawings and calculation that should make a 19" rack workable
The OB6 has one filter section and distortion section (and knobs) less than P6, that should free up some space
if the Clock , App, Seq and Effects on the top row width fits in 19" (~ 432mm) perhaps it could be workable.
Move the switch board switches a little bit close to each other too.
Move the power adapter outside.
If the outer case makes it > 432mm wide, then use the approach like the Moog mother 32 to have a separate desktop case to mount the module in. if electronics need some more space, make it a bit deeper, there is sufficient depth space in a 19" rack. (alike Moog RME)
Probably DSI has time constraint with all that is going and reuse the P6 case and board with minor layout changes. but well.. who am I.