Yes. During your development we anticipate that a fair amount of games will have their original vision of concept change or even go a stray after a few months into development. Listen to any GDC Radio podcast or read any large software studio's postmortems and you'll see changes all along the way to the final product.

We expect some changes so we would like you to elaborate on how it comes together at that point. Any major changes, list them. Besides, it's a good, healthy game design & development practice. Wink
I agree WILL, but I don't believe it belongs in the Readme.txt file. The Design Document is a living breathing document that follows the life of your product (read my article). BTW: Just looked at all of the 360 and PC games that we work on, don't see a single readme.txt . Lots of design document versions though with track changes enabled and html files that contain version/change history (copied straight from the design document version history section).