GamerScoreBlog’s posted up some screens of the games marketplace in New Xbox Experience, and some of the current functionality, just for good measure.
From the post:
Here’s a snapshot: When you go into the new Games Store this fall, you will be able to check out screenshots of the game, watch trailers and read the back-of-the-box description like you are shopping at a retail store. The Games Store will also display every available download for the game you are looking for. Let’s say you are looking at “Gears of War 2,” you will have all available Gears of War 2 options easily accessible such as: previews, trailers, gamerpics, themes, game add ons, game images. You’ll never need to search for the content you want.
Plenty more through there.