The initial version of Chrome's 64 bit already released in June, and the beta version in July.
So if you are a Windows 64-bit user, then you already can download and install a new stable 64-bit version of Chrome. The stable version is working more fast and secure, but in beta version, there are some bugs.
Download Google Chrome 64-bit for Windows
You need to know that 64-bit versions of Chrome cannot be installed on a 32-bit version of Windows, even if the system processor is 64-bit capable.