Ever the consummate hype man, Hideo Kojima is fluffing up Metal Gear Solid: Peace Walker by teasing an apparent system-selling feature. "I haven't announced this yet, but there's another feature in [Peace Walker] that will surprise people, to the point where they'll want to go out and buy a PSP right now!" Kojima blabbed in the latest issue of Famitsu (as translated by 1UP). Short of some sort of in-game subliminal advertising (hey, these guys like to experiment), we're thinking The Two-Hundred-and-Forty-Nine-Ninety-Nine-Dollar Feature -- or maybe it's just "The Buck-Seventy Feature" -- could get lost in translation. After all, the two Peace Walker features that have been newly revealed seem distinctly Japanese in their appeal.Also plucked from the pages of Famitsu, is the revelation that Peace Walker will feature Yamaha's Vocaloid software. (Yeah, we'd never heard of it either -- just wikipedia it.) If we understand it correctly, Vocaloid will allow certain weapons in the game to sing and scream. Mm-hmm, sounds incredibly annoying.Also revealed: Those 2D-illustrated cut scenes? Yep, like this one. Well, they're interactive. "For example, if you zoom in on the scene where you first meet Paz, you can see the uniform she has on under her coat, and then what's under that," art director Yoji Shinkawa explained ... rather creepily. "It's an idea I came up with while thinking about what makes games different from movies or animation. I think it's pretty interactive." Hopefully, not too interactive.