This will be an end of a chapter: they want to kill Ryu Hayabusha. Even if Ninja Gaiden 3 didn't sell as vastly as its predecessors had sold, their decision is a little iffy. Compare
Wrath of the Lich King. Are they sacrificing Ninja Gaiden's legacy for a new IP? It's intriguing to see Keiji join Tecmo.
The trailer says that Ryu did not only cut off Yaiba's arm but kill him too albeit death is often a result of an arm cut in reality. From the clip:
A fallen warrior
back from the dead
to fight the undead
and kill his killerWicked graphics and gameplay could condone Ryu's death, at least partially, in a world where the undead arise. Looking forward. Inaf said.