The treehouses are being re-built on the existing 60 or so plots. They are being manufactured by a company that specializes in prefabricated homes. The plan is to start trucking them in and installing over the next couple of months.
As others have said, no word on whether they will be
DVC or not. previously the treehouses were mostly serviced by the Disney Institute infrastructure. The DI is now Saratoga Springs. That may or may not have any relevance here.
The rumor about them being part of POFQ seems a little far-fetched to me. These clearly aren't Moderate-class accommodations and the SSR front desk would be closer.