My friends are calling it the "The new Xbone". That's probably what I'm going to go with.
MS does many things right, but their naming conventions always feel like they're trying to play mind games with customers. To which my response is "To hell with your stupid naming conventions".
Sony:
Playstation 1
Playstation 2
Playstation 3
Playstation 4
Playstation Pro
Microsoft:
XBox
XBox 360
Xbox One
Xbox One X
It's like they think people are going to compare consoles based on the name, rather than its merits.