Update 2: 2K has corrected an error in its original press release - WWE 2K18 is scheduled for a "Fall 2017" release on Nintendo Switch.
Fall officially ends in mid-December, so this could mean up to a two-month wait after the PS4 and Xbox One versions arrive - or it could simply be a way to allow for any unexpected delays in production that would cause the new version to miss an intended October 17 release
So yeah sounds like it was misreported as day and date with PS4/XBO -__-
Yep - surely due to any finalization they needed to fine tune the middleware plus the individual port. I'm sure they are internally aiming for same date release, but don't want to misrepresent that to gamers.