According to the book "Creating the Filmation Generation", Magicats was written as a possible back-door pilot which could lead to a spin-off series. But development never went any further beyond the initial script.
Horde Trooper: [after a Horde Trooper asks another Horde Trooper why Hordak is in such a rush to have the Magicats Queen delievered] We're not supossed to think.