Guys, I feel the Ursa Mini and the UM Pro are really different models in a similar case with the same sensor. After that, they differ in many ways.
The UM is aimed primarily at Cine style shooting, in controlled situations, either on sticks or handheld. The UM 4.6 has two options, based on lens mount, EF and PL. The PL model did add a B4 mount in an attempt to cover some ENG like shooting situations, but fell short due to the cinematography set up with shooting options based on a menu system, abiet, a well layed out menu system, but it requires the 5-inch monitor to access, and select options with.
The UM Pro has one model, with interchangeable lens mounts. Many of the menu only functions that are needed quickly in ENG/Documentary shooting is available on the outside of the camera with physical switches, selector knob and a small mpB&W monitor for set up selections, including a actual power switch on the outside, so the color monitor can be left folded in. A nice option here would be to be able to rotate this monitor the other way round (like the AF100 did) to access the color monitor when the camera is in a gimbal rig. This is where the big differences lie, in the way the two cameras are designed to be used, the Mini on sticks, and the Pro more of a shoulder mount rig, that also is at home in sticks.
These additional controls are a make or break feature when shooting quick moving Documentary type situations. The two models complement each other nicely, and offer the user a choice as to which features are important to the type of shooting they do.
Cheers