Actually Rocketeer was a licensed property, Disney did not create it but they gained the media rights to it. The movie itself is really good and the reason Joe Johnson directed the first Captain America movie.
As for the show, the original Rocketeer is seemingly Kit's great grandfather, Ambrose's dad (the ages work out although it makes me sad that Kit's parents are around my age). Kit's dad is voiced by the original Rocketeer, Billy Campbell and her mom is Kathy Najimy (best known as Peggy Hill from King of the Hill and Mary Sanderson from Hocus Pocus).
The show itself is kind of basic which makes sense since it is targeted to a very young age group. My 1.5 year old loves the show. He's made us watch the 6 episodes that aired so far like 5 times each (and he get upset when Kit gets her rocketpack stolen). As an adult, it's a pretty solid show so I don't mind rewatching it (although thank god for a new episode on Friday).
If you have young kids, I highly recommend the show.