Windows 9 is set to be unveiled on September 30

Microsoft is planning to release a preview build of Windows 9 at a special press event on September 30, according to sources.
The date could still change, but September 30 lines up neatly with previous leaks that suggested a late-September or early-October release date for the Windows 9 technology preview.
It’s still unclear exactly how many of Windows 9′s hotly anticipated features will actually make it into the September 30 release — but hopefully we’ll at least see the resurrected Start menu and Metro apps running on the Desktop. We wouldn’t be surprised if you have to wait a little longer for the consumer preview of Windows 9 before you get to play with your new Cortana digital assistant, however.
Hopefully everyone will be able to download the Windows 9 preview — just like the early public builds of Windows 8 — but there’s a chance that Microsoft will only release it to developers and professionals via TechNet and MSDN.
Microsoft, with its accelerated release schedule and exciting features like Cortana and virtual desktops, is clearly trying to prove that it still cares about normal (laptop/desktop) PC users.
While Cortana is useful on a smartphone, I think it might be surprisingly powerful on a laptop or tablet as well. Using Cortana on a PC could be just like the voice-activated computer in Star Trek.
Source: Extreme Tech