It involves competitive bidding and countdowns
to auction ends, much like eBay, and looks like you will be
able to monitor
auctions online from the Forza
auctions page, too - they explain: «The cool thing is that browsing these
auctions once the game
goes live is like
going to a virtual car show — each one of these cars will likely have been modified, tuned, painted, and otherwise customized in some fashion.