Jesus... yeah, I'll be buying the fuck out of this. The first game isn't my favorite, but if this could lead to the rest of the series going HD, count me all in.
Though I do have to say, the trailer shows off exactly why this hadn't already happened. Just like I always figured, the pre-rendered backgrounds pose a problem. They tried to touch them up, but they were never intended for widescreen. If anything, they just look kind of muddy and blurry now.
But whatever, it's still Onimusha.
Good god, though... they better include the Japanese voice track, like in the original release. I don't think I ever played it in English, and that trailer is the proof that I made a good choice on that. The English dub was shit, even for a 2001 game.
EDIT: Just checked the site, and it seems they're actually including an option to switch between widescreen or 4:3 on the fly. So that's really cool. I'll probably stick to 4:3, since widescreen literally just zooms and cuts off the top and bottom.