Windows 10 consumer review expected in January-February 2015

The Microsoft Windows 9 which was scheduled to be released on September 2014 was later renamed as Windows 10 and the released was postponed due to leaks of its preview.Now,Microsoft is expected to release the consumer preview of Windows 10 early next year.
 The new Windows version brings in new features such as the new start menu,Modern User Interface Apps and much more. 

 Windows 10 Consumer Preview features: 

The consumer version is expected to bring a new start button with the cortana personal assistant.

Although it is unclear about the public appearance of cortana,Microsoft could unveil the cortana alongside the Consumer preview of Windows.