Ahh finally! Fourze’s promo aired after the latest Kamen Rider OOO episode, which is episode 47. He will premiere on September 4th, 2011, two weeks from now.
UPDATE 8/23/2011: Here’s another trailer which is literally the same as the trailer we seen back then in the press conference, only this time it’s in higher quality.
Gentaro Kisaragi, a new transfer student at Amanogawa Academy says “I will become friends with everyone” on his first day and creates the “Kamen Rider” club. That’s how he came to know Kengo Utahoshi. That Kengo is the one who first had the Fourze Driver, but he gives it to Gentaro which drastically changes his life