Microsoft confirms Windows 8.1 will include boot-to-desktop options and a restored Start button. But other interface criticisms remain unanswered. From InformationWeek:

Rather than replicating the Windows 7 button, the new version will connect to the Start screen -- that is, to the same Live Tile interface to which Windows 8 currently boots. Users can set the button to summon an "All Apps" view, however, in which app icons can be arranged by usage, installation date, name or category.

The Start button will most likely benefit traditional mouse-and-keyboard users, but users with touchscreens will be able to access "All Apps" by swiping from the bottom of the display. The Start button will be visible at the bottom of the taskbar when the user is in desktop mode but will only appear in the Modern UI if the user moves the mouse to the lower left-hand corner of the screen. Microsoft also said that newly installed apps will only appear on the Start Screen if the user pins them there.

 Windows 8.1 Restores Start Button, With Twist