Take this with a grain of salt, but a leaked image of the new Windows 9 start menu has appeared on the web. A rough and dirty combination of the classic start menu alongside the Modern UI, all in a single menu.
The watermark present in the screenshots says that the new start menu is part of Windows Build 9788, which may be an early build of Windows 9. While the screenshot watermark is labeled as Windows 8.1, ExtremeTech noted that it’s not uncommon to see alpha builds of a new Windows operating system using current version numbers.