Pretty hard to make and market a "one size fits all" camera using only one lens, even if it's a telephoto, which brings a plethora of gimbal balance, stabilization and focal length adjustment issues along with it. The big name camera makers recognized this a long, long time ago.
Something that might be considered for the 520 batteries would be to change the color of the battery latch end. Thee have been too many power loss crashes caused by users failing to properly seat the battery and making the end a color different from the aircraft would automatically draw the users eyes to the battery. helping to increase battery awareness.
Speaking of batteries, I doubt all three camera models will be of the same weight, and expect all of them will will be heavier than the existing CGO-3+ camera. More weight requires more battery if a reasonable level of flight time is desired, and differences in camera weights will generate more or less flight time depending on the camera being used. Inspire users that change between a fixed and zoom lens camera already know this, experiencing much less flight time with the zoom lens camera. I fully expect some buyers of the 520 will lack that understanding and end up complaining vociferously about low flight times if using the heaviest camera.
F.V.
I don't know why it is so but the camera drop out with landing gear action has been pretty much limited to the E.U. version of the H. That version differs from the U.S. version only in the firmware. How that causes conflict between the landing gear and camera is beyond me. A general interest question; Does the E.U version of the H use the PAL image format?