Sooo... I'm assuming it will probably be release monday or tuesday for the wed. release of ios5???? found this at the bottom of the iCloud page :
iCloud requires iOS 5 on iPhone 3GS or later, iPod touch (3rd and 4th generation), iPad, or iPad 2; a Mac computer with OS X Lion; or a PC with Windows Vista or Windows 7 (Outlook 2007 or 2010 required for accessing contacts and calendars). Some features require a Wi-Fi connection. Some features are not available in all countries. Access to some services is limited to 10 devices.
Music features of iCloud require iOS 4.3.3 or later on iPhone 3GS or later, iPod touch (3rd and 4th generation), iPad, or iPad 2; iOS 5 on iPhone 4 (CDMA model); or a Mac or PC with iTunes 10.3.1 or later. Download iTunes 10.5 free.
iCloud requires iOS 5 on iPhone 3GS or later, iPod touch (3rd and 4th generation), iPad, or iPad 2; a Mac computer with OS X Lion; or a PC with Windows Vista or Windows 7 (Outlook 2007 or 2010 required for accessing contacts and calendars). Some features require a Wi-Fi connection. Some features are not available in all countries. Access to some services is limited to 10 devices.
Music features of iCloud require iOS 4.3.3 or later on iPhone 3GS or later, iPod touch (3rd and 4th generation), iPad, or iPad 2; iOS 5 on iPhone 4 (CDMA model); or a Mac or PC with iTunes 10.3.1 or later. Download iTunes 10.5 free.