The release date for Windows 9, codenamed Threshold, has been earmarked as April 2015 according to Windows 'insider' Paul Thurrott.
Thurrott, who runs the blog Windows SuperSite
, is well known as being a reliable source for Microsoft information and his latest tidbit is to reveal that the next version of Windows will be called Windows 9 and have a possible release date of April 2015.
Although he hasn't cited any sources for his information Thurrott is confident that Microsoft will use the company's BUILD developer conference in April 2014 to outline a new vision for the next version of Windows. That vision will include a new version of the Metro interface, dubbed Metro 2.0, with possibly a windowed version of the touch Metro mode.
He also describes how there is expected to be three 'milestone' releases before commercial availability, hinting at a beta, release candidate, etc release schedule.
A key reason for highlighting that the new release will be called Windows 9 is that Thurrott sees Microsoft as distancing itself from the 'disaster' that is Windows 8. As he points out, Windows 8.1 is currently in use on less than 25 million PCs, which for a major new Windows release is very poor uptake. Microsoft hopes Windows 8 will thus be seen as the Vista to Windows 9's Windows 7.
We'll hear more come April 2 when BUILD kicks off.