On July 29, users of Windows 7 Starter, Home Basic, Home Premium and those on the non Pro version of Windows 8.1 will be able to upgrade to Windows 10 Home for free. The interesting language in the specifications page for this upgrade path is also the bit where it mentions updates.

Windows 10 Home users will have updates from Windows Update automatically available. Windows 10 Pro and Windows 10 Enterprise users will have the ability to defer updates.

Although the wording isn't crystal clear here, it seems to suggest that Windows 10 Home users will not have the ability to defer updates - as was previously possible in 8.1 and 7 - and will be updated automatically.