It was recently revealed that Yaiba: Ninja Gaiden Z will be out March 6 next year in Japan.
Yaiba: Ninja Gaiden Z, the zombie-centric Ninja Gaiden game, is on display at E3 and I can confirm one thing: there is at least one incident of panties raining from the sky.
That's a direct quote from this trailer for YAIBA: Ninja Gaiden Z. Just so you know what you're getting yourself in for.
Yaiba: Ninja Gaiden Z takes place in the world of Ninja Gaiden, but it's not canon, says Team Ninja's leader.