Siliconera is reporting that Ninja Gaiden 3 will have an option for dual audio -- that's for both English and Japanese vocal tracks. As I've stated before, I'm a big fan of dual vocal options. Generally in games like this, I'll switch the audio for multiple playthroughs, to help create a different experience. It's by no means required for me to enjoy the game -- it just adds a nice little touch.
As for the game itself -- honestly, like the new Devil May Cry, I have no idea what to expect in terms of quality. As a long time fan, I'll of course be giving it a try, but I hope that they can rekindle the magic Itagaki instilled in the series. Also, I hope the game's harder difficulty levels present enough of a challenge -- for me, that's the true test of quality for a Ninja Gaiden game.