Windows version upgrade command

Displays the edition of the specified image.

• Dism /Online /Get-CurrentEdition

Displays a list of Windows editions that an image can be changed to.

• Dism /Online /Get-TargetEditions

Use the /Set-Edition option with no arguments to change an offline Windows image to a higher edition.

• Dism /online /Set-Edition: <edition name> /AcceptEula /ProductKey:12345-67890-12345-67890-12345

http://technet.microsoft.com/en-us/library/hh825157.aspx