Capcom's mystery game is Sengoku Basara 3
Capcom's latest teaser site, which was last showing the number 1600, was generally believed (and hoped) to be leading up to the announcement of a new Onimusha game. However, the game being teased is actually a new entry in Capcom's other action series starring fictionalized versions of real feudal Japanese warlords: Sengoku Basara, (barely) better known here as Devil Kings -- a series which features Onimusha's bad guy Oda Nobunaga as the protagonist and title character.
No platforms or really any other information were revealed about Sengoku Basara 3, other than the logo, two character silhouettes, and a 2010 date. Previous Sengoku Basara games have been released on PS2, PSP, and Wii (along with an arcade-based 2D fighting spinoff).
The series isn't that well-known in North America, but in Japan, its popularity (and the sudden popularity of actual Japanese history) is boosted by the tie-in anime series.
