According to the resume of an environment artist, a brand new game based on the Shinobi license is coming to Nintendo's 3DS. Now that is something I want to see.
Griptonite Games, a studio known mostly for portable licensed titles and Assassin's Creed: Bloodlines, is heading up the prospective title. Nothing else is revealed about the game, it just has the rather vague name of Shinobi 3DS.
The last Shinobi game was Nightshade on the PS2. It got mixed reviews. I love the old school Shinobi games, so I'd be willing to give this a chance.