As I mentioned in our Windows 8 topic that a new version of Windows could soon replace the doomed Windows 8, we have received news that actually Windows 9 coding has started and that the expected release date (for consumer editions) is said to be April 2015.
According to reliable sources, Microsoft is finalising the feature set of Windows 9, with codename “Threshold”, details of which are expected to be announced at the Build 2014 Conference in April 2014 -but even with these early available news it is expected to be significant chance/step away from the disappointment of Windows 8.
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edit/add: latest news suggests even an earlier date than April for the RTM edition. Please keep reading the following posts.