Windows 10 was released by Microsoft just a few hours ago and already you can download the ISO or USB files directly from microsoft.com (links further below).
I have kept a close eye on the developments around Windows 10 and have installed a number of the different preview releases on virtual machines. I must say it is looking and functioning really well and I am very impressed.
On another note, it seems that every second operating system Microsoft launches is a dud, with the other being legendary, ie Windows Millennium (dud) Windows XP (legendary) Windows Vista (dud) Windows 7 (legendary) Windows 8/8.1 (dud) Windows 10 ???.
Download Windows 10 ISO or USB Files
https://www.microsoft.com/en-gb/software-download/windows10
Enjoy and let me know your Windows 10 experiences!