As posted by Che Chou (Forza Motorsport Community Manager) and by email Forza Motorsport has been dated for May 2007. While not a definitive date, the first half of May is what is targeted. Also mentioned in the update are the tracks that will be in the game.

Forza Motorsport 2 Tracks

• Mugello Autodromo Internazionale
• Suzuka Circuit
• Sebring International Raceway
• Mazda Raceway Laguna Seca
• Tsukuba Circuit
• Road Atlanta
• Silverstone Circuit
• Nürburgring Nordschleife
• Maple Valley Raceway
• Sunset Peninsula Infield
• New York Circuit
• Test Track

Admitted, these are a paired down list of what was originally the goal for the game. Some tracks have been cut to ensure the game gets done in a timely manner, so get ready for some downloadable content to be coming after the games release.

[via Forza Motorsport.net, Gamertagradio]

-thewilleffect-