According to Russian blogger Eldar Murtazin, Microsoft has started planning for Windows/Windows Phone OS that will release in 2015, which will unify phone and tablet OS.
He claims Microsoft has formed a working group to create a blueprint for the next major version of Windows Phone, and that this may include a complete review of the critically acclaimed but divisive Metro user interface.
Eldar is also reporting that the new OS will be built from scratch just like Windows Phone 8 was developed after Windows Phone 7, and that it may once again break compatibility, explaining why Microsoft increased the support date for Windows Phone 8 from 18 to 36 months.
The first designs are expected to be presented internally in the fall, with the launch of the unified OS expected in 2015.
Eldar has been an annoying but relatively reliable source, meaning the leak should probably be taken seriously.
A review of the UI of the OS for its next major version is probably a good idea, to stop the fresh Metro UI from going stale, but breaking compatibility is sure to set the OS back tremendously, something we clearly saw demonstrated in the switch from Windows Mobile to Windows Phone, when sales dropped from 4 million per quarter to 0.5 million per quarter, and Windows Phone 7 to Windows Phone 8, which also saw a precipitous drop in developer interest and a major slowing in the growth in the Windows Phone Store following this.
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