Microsoft should stick to its guns and keep the Start button gone
Source
A Guy
Microsoft has shown some screenshots of some of the user interface improvements and alterations it's going to deliver in Windows 8.1 later this year.
These include more personalization, a Settings app that doesn't force you to use the Control Panel, richer multitasking with more apps visible on-screen, multimonitor support for Metro apps, and unified search.
Also being brought back: the Start button. When running desktop applications—but not Metro applications—a Start button with a Windows logo will be on the taskbar and when clicked it will take you to the Start screen.
Source
A Guy