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The new Ninja Gaiden Sigma trailer hit the web recently and it's not looking too bad. Re-developed for PlayStation 3 and apparently running at a smooth 60fps @ 720p, it's no ugly duckling. Mind you, it's not quite Heavenly Sword...
The HD version is worth checking out if you're picky about these things...
I'll be checking out the demo which is touted as hitting the Jap & U.S PS Stores by the end of April, so watch out for those updates.