Yes, there are plans to made others too. ArduPilot is just the main name of the organization and that way “easiest” to start. Others we need to think on how to present them.
Maybe ArduPilot as a smaller text and turned 90 degrees on either side of the mug and then vehicle name as ArduPilot is now. After designs are done, it’s not a bit issue to make them available.
How would you like to see them?? There are also some rather good slogans for those different vehicles.
Such as: