The first big Windows 8 Update aka Windows Blue is at half-way mark. Release is planned for later this year.
The Microsoft Windows team has reached the half-way milestone (M1) for Windows Blue. Windows Blue is a Windows 8 refresh coming later this year.
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There is also supposed a Windows Blue update coming for the mobile devices. Via ZDNet.
I am more excited about a possible major OS X and IOS update from Apple. Apple lags a bit behind with the UI of the current operating systems.