IIRC its got something to do with Rights ownership. The first Disney made PR, Wild Force I believe, brought in a whole new set of guide lines for the series. Somewhere in the series Saban sold the rights over to Disney, and Disney fucked the Dragonzord in the ass.
So if Saban held onto the publishing and distribution rights, then you might see old school PR episodes. If not, then Disney will have to realize that they will make money from it and release them.
MMPR through ZEO = Awesome.