I'll probably be picking it up at some point (Probably not day 1, but hopefully soon enough). I've seen some videos of it, and the graphics I must say are mighty fine. I'm a big fan of the prerendered backdrops, and from what I've seen, the action is really smooth.
I'm wondering if the difficulty will be the same as the series usually is. Sometimes difficulty is good with portable games though, since you get a lot of bus rides, etc out of it. Besidse, it cannot be harder than Izuna: Legend of the Unemployed Ninja. Or well, I hope so.