It will be transferred to the Trump Presidential Library shortly before he leaves office.
Lots of links around mention this:
Qatar-Gifted Air Force One Painted, Final Modifications Underway
The 'bridge' Air Force One is expected to roll out this summer, the Air Force said, and a photo of its red-white-and-blue livery has emerged.
www.airandspaceforces.com
He states he won't fly around in the plane it will be put in a museum, which is a crock.
Obviously he will use it (or sell it) after he finishes being president.
If the air force has spent hundreds of million upgrading the security of the plane why would it not be left with the air force?