Windows 8 was released on Oct 26, 2012. Apple MBP & iMac users started installing Windows 8 from the same day. However, Boot Camp was fully not supporting Windows 8.
Today, Mar 14,2013 Apple has officially released the support for Windows 8 through its Boot Camp.
Here is the link to download Boot Camp drivers for Windows 8.
If you failed to download the software while installing the Windows 8 through Boot Camp, you can still download this using the below url.
http://support.apple.com/kb/DL1638
