There about, what, 52 Ruby Spears episodes, right? That's about 104 COPYRIGHTED songs that Time Warner would have to pay out the nose for, so, no, don't expect those episodes out anytime soon. The Dic episodes and Chipmunks Go To the Movies used original songs, so those stand a better chance of coming out.
And we'll see a Captain N movie when Nintendo ensures that it's current roster of popular characters (Link, Mario, Kirby, Pikachu, etc.) take center stage.