Apple will today announce their new iPhone 5S and iPhone 5C. Its expected that they will simply run through basic numbers (as they always do) then launch the 2 new iPhones and then launch the iOS 7.
Apple will spend time going through iTunes numbers, iPhone numbers, then probably announce the new versions of the iPhone. Then they will re-run through iOS 7 and then announce when it will be available for download and in what countries.
The main version of iOS 7 everyone is looking forward to is iRadio. iRadio is a free music streaming service that will allow anyone to listen to music for free on their iPhones (unlimited).
Its expected that Apple live stream the keynote via their own website. Additionally you can check our live coverage from leading tech blogs: