As the iOS 7 is in beta testing and is only available to developers, will not be available to other users for installation before the fall. Anyone who wants, Beta version can be installed as follows:

1.) Download Beta for your iDevice

Code:

http://ibetadownload.com/download.html

2.) Download the iTunes (if you don't have one)

3.) Right click on your iDevice within iTunes and make a backup

4.) Hold down the "Option key" in OS X or Shift key in Windows and press the "Update" button

5.) Select the iOS beta 7 file you've downloaded and upgrade your iDevice with iOS Beta 7