The news of a new Ninja Gaiden game came straight from Team Ninja, not IP owner Koei Tecmo, according to Noisy Pixel. Team Ninja delivered the keynote address at the Korea G-Star conference, a gaming trade convention. All that has been confirmed is that Team Ninja is working on a Ninja Gaiden reboot, but no more information about the project has been released.
While this is the first time a Ninja Gaiden revival has been announced, there have been several signs that it would come shortly. Ninja Gaiden: Master Collection, a package comprising definitive copies of all three Ninja Gaiden games from Team Ninja, was published in 2021 by Koei Tecmo for PC, PS4, Switch, and Xbox One. It may be seen as Koei Tecmo testing the waters for the return of Ninja Gaiden, or as Team Ninja warming up to work on the series again.
