Deploying Windows 8 Consumer Preview with MDT 2012 RC1 is not very different from any other operating system.
The only thing you need really to be aware of is that Windows 8 Consumer Preview is a retail edition (non-VL), meaning you need to specify the product key. In the Sources folder you have a file named product.ini which contain keys good for installation, but not activation. You should rather use the product key specifed om the public Windows 8 Consumer Preview download site: http://windows.microsoft.com/en-US/windows-8/iso
The product key for the English version if Windows 8 Consumer Preview is: DNJXJ-7XBW8-2378T-X22TX-BKG7J
Since the Windows 8 Consumer Preview is a retail edition, when creatting a Task Sequence in MDT 2012 RC1, you need to select the last option for specifying the product key.