A Reddit user has discovered assets hosted on the XboxLive.com server of what appears to be an unannounced Midnight Club game running on Xbox One.
The following two screenshots were discovered:
Along with the following “My Xbox Live Games” icon:
The latest entry in the Midnight Club series is Midnight Club: Los Angeles, which was released for PlayStation 3, Xbox 360, and PSP in 2008.
Thanks, NeoGAF.