the firmware to sync the cameras is all GPRO as well.
I haven't functionally used it but I've witnessed it being used, I can't fly for shit

But battery change outs isn't a huge issue for it's intended purpose. There aren't many times I'm going to be physically active in the zone for greater than 20 minutes. What I didn't like was how often it ran into shit and crashed

it often found a way to hit the only tree in the park

I don't see a good use for it in nature after seeing what I saw which eliminates a huge use case for it. Also, it wasn't very accurate and struggle to make the user the main focus of it's shot. It needs more sophistication.
I know the pilot in that video, he's very skilled at what he does but I don't think it's exceptionally hard to keep level manually, I do assume they have an auto level function. The bigger wow factor for me is not horizontal or vertical leveling, but there is no "warble" from the rotors... so the camera is fully vibration dampened.
I don't think it would make sense to launch them in the same quarter though. I could see the drone and spherical in Q1 of 16 and the new camera in Q3. This would really help cement good sales. Bolster their spring/summer with drone and bolster Christmas with new camera.