The Infineon Raceway website was finally updated with the details: IRL is coming to Infineon on August 26-28 2005. This will be the first ever road course event since IRL was founded in 1996. It's also the first major open wheel event coming to Sonoma since 1970.
In a smart move, the raceway already has 2005 ticket information posted. In a maybe-not-so-good move, the price for season tickets jumped from $295 to $425. It's still a good deal and I'll probably renew my tickets, but it's not quite the steal it used to be.