Ninninger Opening/Ending Theme Details
 

Opening theme is called "Saa, Ike Ninninger" performed by Yohei Onishi. He did Toq6's theme earlier this year:

https://www.youtube.com/watch?v=SKjFtLbQfc4

Ending will be done by Daiki Ise, a member of Project R. End song is "Nan Ja Mon Ja! Ninja Matsuri"

I hope we get something along Gekiranger and Shinkenger for the OP.
As for the ED I assume this will be either something like that matsuri ending for Megaranger or Kakuranger's ED.

I'd really like an opening like that.