Hmm, I bet the timing of this deal explains why we got the "remastered" original MMPR instead of a Shinkenger adaptation. Why would Disney spend money on a new season of a property it was offloading?
I would lay money on Saban intending to revitalize the brand through some sort of Shinkenger (or possibly Goseiger) adaptation. You could do all of the Shinkenger high notes in about 20 episodes, though.
Nickelodeon is a very logical home if Shinkenger is the series Saban wants to relaunch with. I could see the network that produced Avatar being perfectly okay with the most Japaneesiest Power Rangers series ever to Japan.