It was said by somebody that works for Microsoft on stage at a Microsoft conference [1].

> “Right now we’re releasing Windows 10, and because Windows 10 is the last version of Windows, we’re all still working on Windows 10,” Nixon continued. “And it’s really brilliant. So I can say things like, yeah, we’re working on interactive tiles and it’s coming to Windows 10 in one of its future updates, right.”

> Microsoft didn’t deny what Nixon said, but it also didn’t back up the “last version” of Windows, either.

For all reasonable intents and purposes "Microsoft" said this was the case then had to walk it back.

[1] https://www.pcworld.com/article/394724/why-is-there-a-window...