What part of my comment falls under the "no"? It was one guy (a Microsoft employee) stating one time at one conference speaking to a completely unrelated topic (Live Tiles). You think Jerry Nixon, a developer evangelist, was the kind of person authorized to make such a statement of "Windows 10 will be the last version of Windows" while giving a presentation on Live Tiles?
If a developer evangelist was giving a talk about bringing Clippy back to Word and how you can add your own prompts and they made the statement of "we're discontinuing Xbox", would you take that as an official statement of Microsoft's intentions?