There is an update coming for Windows 8.1 that will make all non-touch Windows devices (think desktops and non-touch laptops) boot to the desktop instead of the new interface. This is a welcome change and something that we've wanted since launch. Unfortunately, this is complicated and has been delayed until the middle of April. This update addresses a lot more than that of course, but that's what I'm looking forward to most.
Windows leaker WZor indicated on February 2 that a more likely scenario may be that boot to desktop will be installed by default on new PCs/devices without a touch screen. Users who are upgrading from Windows 8.1 to Windows 8.1 Update 1 who don't have boot to desktop set as their default already also won't see their settings change to boot to default, according to WZor.