Finally the pc demo has been released.. Here are some mirrors for downloading it.. (size 650 mb)
http://www.gamespot.com/pc/driving/needforspeedcarbon/download_ini.html?sid=6160596
http://www.gamesfire.at/downloads,id233,need_speed_carbon_demo.html
http://worthdownloading.com/download.php?gid=2038&id=9179
http://www.gamedemos.de/index.php?show=demos&action=details&did=827
http://web2.donau201.server4you.de/nfs_carbon_demo_eu.exe
http://www.gamershell.com/download_16174.shtml
http://largedownloads.ea.com/pub/demos/NFS/Carbon/NFS_Carbon_Demo_EU.zip
Sorry for bumping in hehe