Going off the pictures, I'm guessing that the people in charge of designing the new Jupiter horns looked at other products out there. The mellophone is frighteningly similar to the Yamaha mellophone. The contra as well looks similar to King. It seems like these horns are going to be the next Yamaha, if you know what I mean.
Fake Edit: The mellophone bell is huge! 10.7 inches. The baritone bell is only 10 and the euphonium is 11. Zero visibility anyone?