To quote from an article on the UK PC Pro site:
Julie Larson-Green, corporate vice-president for Windows, revealed that Windows Blue will arrive as a "public preview" at Microsoft's Build conference, which starts 26 June. While Build is targeted at developers, the public preview will be available to anyone with Windows 8, according to ZDNet.
She also revealed Microsoft was having "meaningful discussions" about whether to bring back the Start button, but said the company remained fully behind the Start screen with live tiles.
"The Start menu was never built for a lot of applications," Larson-Green said, according to CNet. "The Start menu is not the be-all end-all. But a button might be useful for some people to have on the screen."
The full article at http://www.pcpro.co.uk/news/380713/windows-blue-8-1-release-date-screenshots-features
So, the Start Button was never built for a lot of applications!
Well, if the MS Windows Team haven't noticed, it works far better for a lot of applications that the 'Modern' tiled start screen.