Microsoft have mentioned a few times that Windows RT devices will get an update to Windows 8.1 and not get a full Windows 10 upgrade. In July Gabe Aul confirmed that a Windows 8.1 RT Update 3 will be arriving in September and now we have official confirmation from Microsoft that there will be a new start menu and lock screen. The start menu will be based on an early version of the Windows 10 start menu not the current one shipping with the OS, see my picture.
On Microsoft’s Windows 10 FAQ there is a small section related to Windows RT:
What about Windows RT?
If you’re running Windows RT, your device won’t upgrade to Windows 10. We will have an update available in September 2015 that will improve the Start menu and lock screen. Check Windows Update on your Windows RT device to make sure it is ready to download the update when available.
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