Windows 10 Technical Preview (10/1)
Microsoft announced today during their Live event that they will be releasing a technical preview of Windows 10 tomorrow, October 1st. Yes, they are skipping right over Windows 9. I guess they want to get as far away from Windows 8 as possible and skipping a version may work.
You must sign up to the Windows Insider Program to get access to the downloads (here).
Some other links for additional information about Windows 10.
Announcing Windows 10 (here).
Windows For Your Business (here).