Y'all might want to remember this from the leak last year
"Imagine that a year after Forza 3 was released, a new update [sic] version of the game became available (for example, Forza 3 2010) that not only included all cars and tracks previously released over the past year, but also 30 of the coolest new 2010 cars and a new unreleased real-world track. It would further include the top 20 user-generated car skins and car tuning setup from the fastest track cars. In addition, all professional race cars would revised [sic] with their new 2010 liveries (paint schemes). The price of this updated 2010 version of Forza 3 would be $39.99.
MS is using Forza 3 as a two pronged assault, they'll release it this year, unchallanged and then re-release it around GT5's release and snag even more sales. Imagine if they bundle it for Holiday 2010, thats another couple of million.
