Namco Bandai has updated the teaser site it launched this week with some slim platform and genre hints.
Text on the site now reads "action adventure", and the PlayStation face button logos are shown.
Sony has three current platforms which use the face buttons - the PlayStation 3, the PSP and the Vita, but as practically everything in Japan comes out on either of the first two, making a tease kind of wasteful, I'm going to put $5 on the Vita.
Still no idea what it could be; Bandai's Gundam license hasn't made an appearance on Sony's new portable yet, so that's a possibility.
The site seems to update nearly every day so we'll keep an eye on it.