Hello guys at the moment the developer preview is up for grabs currently on the recently launched Developer site. There are two types of builds obtainable over the Developer site. Initially is through Developer tools and a 64 Bit version at the same time as the additional version is Without the Developer tools within 32 bit as well as 64 bit version. You can get the Download Windows Developer Preview in the following link which comes in a 32 and 64 bit version. Take a look on it.
Windows Developer Preview English, 32-bit(x86)
Windows Developer Preview English, 64-bit (x64)