Oni Central has a note up pointing us to ps2.ign.com's Oni preview. Thanks to Dan Rudolph, who posted the item in the Oni Central forum.
From the review:
When we first got to play Oni, most of the game world wasn't populated with enemies. However, in one special level, we did have the chance to see her fight against at least four other enemies. The game's strongest points are found in the blend of martial arts fighting and weapon-based combat and its full 3D range of moves. Its one thing to use a weapon, but it's another to knock an enemy's weapons from his hands, pick that same weapon up, and then dust him with it. That's satisfying.
The preview also notes just how huge Oni's 17 levels really are, as well as how many polygons make up the Konoko model in the PS2 version-- a stunning 1,200. Go have a look for yourself.