As with every keynote, just a couple of hours before the kick-off, the Apple online store goes down till after the keynote. Apple is expected to reveal the next generation iPhone. This year Apple will introduce not one but two new iPhones. The one called iPhone 5C will probably replace the iPhone 5. The one called iPhone 5S, will be new high-end model. More news about iOS 7 and maybe OS X Mavericks is expected as well. The keynote starts at 10 AM PST. You can read all about the announcements here on iPhonefreakz.