http://www.networkworld.com/article/2689722/windows/microsoft-windows-165000-first-look-windows-10.html

QUOTE:  Although Microsoft is skipping a whole version number for the next Windows version, which will ship some time next year, the early version of Windows 10 it showed off today was mostly composed of commonsense fixes to Windows 8, better integrating its Desktop and Metro halves and being smarter about adapting to keyboard and touch environments.

A big complaint about Windows 8 was the lack of the familiar Start menu that debuted in 1995. Windows 8.1 brought a Start button, but all it did was switch between the Metro and Desktop halves of Windows. Windows 10 brings back the real Start menu, but with the Metro tile look from Windows Phone and Windows 8’s Metro screen.

Windows 10 will let Metro apps run in Desktop windows like any other app, getting rid of the duality of Windows 8. That leaves the question: How’s a Metro app different from a Desktop app beyond the look and feel?

Windows 10 brings Windows 8.1’s snap feature to the Desktop, so you can arrange app windows in a tiled view. Yes, Windows has long supported a tiled view within apps (for their document windows), but now you get the capability among apps themselves.