Windows 10 : A substantial leap form Microsoft

Microsoft has announced the first details of Windows 10 – its next operating system (OS) on yesterday. This was a surprise to all  who  were expecting Windows 9 but  Microsoft claims it as a significant leap over Windows 8. Originally codenamed "Windows Threshold", the new operating system essentially does away with the dependency on the tiled "Metro" user interface that Microsoft had attempted to implement across its entire device line, from desktop PCs to Surface tablets and Windows Phone devices. 
Windows 10 is such a substantial leap, according to Microsoft's executive VP of operating systems, Terry Myerson, that the company decided it would be best to skip over Windows 9, the widely expected name for the next version. The software maker has been quietly reengineering Windows to focus on faster updates of their new operating system
"Windows 10 will run across an incredibly broad set of devices," from 4-inch screens to 80-inch screens, Microsoft said. "Some of these devices you hold in your hand, others are ten feet away. Some of these devices you primarily use touch/pen, others mouse/keyboard, others controller/gesture—and some devices can switch between input types. We’re not talking about one UI to rule them all—we’re talking about one product family, with a tailored experience for each device."
Windows 10 is expected to release to public in fall of 2015, but  Microsoft has already opened up the OS to dedicated beta testers under its Windows 10 "Insider Program."