Apple has added an article on their support site with instructions for installing Windows 10. Good for any of you who have a Mac but want to try out the new version of Windows. To install Windows 10, Apple says you will need a 64-bit Mac with OS X Yosemite, a 64-bit copy of Windows 10, and the newest version of Mac OS X and Boot Camp Assistant.
You can use Boot Camp to install Windows 10 on supported Mac models that have OS X Yosemite installed.
You need support software (drivers) installed with Boot Camp to use Windows 10. This software is automatically downloaded when you use Boot Camp Assistant. Boot Camp supports 64-bit versions of Windows 10 when used with a supported Mac.
Windows 10 is available from Microsoft as an ISO file, an installation DVD, and a USB flash drive. You need an ISO file of the 64-bit version of the Windows 10 installer to install Windows on your Mac. If you don’t have an ISO file, you can use Disk Utility to make one from your Windows installation DVD or USB flash drive. If you’re installing Windows for the first time, make sure the Windows installer you’re using is for a full installation (not an upgrade installer).