[Note: this is a shortcut variation on the steps in the Technet article on http://technet.microsoft.com/en-us/library/jj134039.aspx and should for now only be used in lab scenarios as it hasn't been officially tested by the PG's]
The short version;
The long version; http://technet.microsoft.com/en-us/library/jj134039.aspx
I do not see this scenario listed in the migration documents you link to above. What I do see is to backup everything, perform and in-place upgrade of the OS and reconfigure everything. Not as easy as listed in the step above, while they do make so much more sense.
Can you refer to the exact section for this scenario?
This is a variation on step 8-10 in the Technet link - you should probably limit this to lab scenarios until the Technet documents are updated.