Yes, Windows 8 is actually Windows 6.2, versioning-wise. As I’m sure you remember, Windows 7 is Windows 6.1, and Windows Vista was Windows 6.0.
Don’t be surprised if Microsoft ends up making the successor of Windows 8, Windows 6.3, because most likely, this is the plan.
The Windows OS version increment can be a source of incompatibilities with existing applications, especially if they’re designed to check for upper bound OS version.
Windows 8 Is Windows 6.2 - Softpedia