The on-disc version of Telltale Games' The Walking Dead has a release date. You'll be able to play it on December 4 for the PS3 and 360.
A total of five episodes of The Walking Dead are planned for downloadable release, and the disc version will almost definitely contain the first three episodes of the downloadable point-and-click game, and may contain episodes four and five as well. Right now, there isn't a whole lot of information about the disc version, beyond a tweet from Telltale, that seems to have been taken down.
I'd love to be able to tell you how much it will cost as well, but that information isn't available either. I'll see what I can dig up (out of the GRAVE) and let you know what I find out.