3. For Those Who Purchase Their Pcs (Windows 7 Installed) Between 2nd June 2012-31st January 2013:
In such a case, the users can order an online upgrade from Windows Upgrade Offer at just $14.99.

4. For Those Who Want To Install Windows 8 In A Virtual Machine On Mac/PC That Does Not Have A Windows License:
Such users can order an OEM copy of Windows 8. Though waiting for Microsoft to announce the price of full licenses should be a better option as these prices are expected to be very less during the introductory phase.

5. For Those Who Want To Downgrade To Windows 7:
In case of a new PC with OEM installed Windows 8 Pro, the Windows 7 media can be used to installed Windows 7 Professional. However in case a user bought a PC that contains the base edition of Windows 8, the only way he can downgrade to Windows 7 is by buying a retail copy of it.

Also Read: MS Office 2013: What Matters For The Enterprise

Also Read: 'IT Dept Should Come Out in the Open' - Know Why