Actually, the sync speed is 1/90th with the 200 series cameras, which is okay in the studio, but not so good for fill outdoors ... however, with the 500 series lenses mounted on the 200 series cameras all shutter speeds are available up to 1/500th are available ... basically the camera can be a two shutter system depending on which lenses you use. It's not an either or situation with the 200 cameras.
NO, the new CVF/39 doesn't rotate ... the full 39 meg 1.1X use of the sensor is limited to landscape orientation ... especially when using the waist level finder ... same as the Leaf AFi which doesn't offer a rotating back either.
Since the meter is in the camera body on the 200 cameras, there are finders that will allow shooting the camera on it's side, I know, I have one : -)
However, I can also use this same back on my RZ Pro-II which does have a rotating back.