Gamerscore Blog has the first of a series of posts detailing the new Xbox experience coming this Fall. Part one of the updates shows off how the "games played" area will look on the new dashboard.
"The first card shows all of the Achievements you’ve unlocked and lists out your overall Gamerscore and the highest possible Gamerscore you could have based on the games you’ve played. To the right of that every game you’ve played will have its own card that fans out. If you’ve played 3 games (like this account has), you will have 3 cards. 500 games? All 500 will fan out on your screen. You can check out what Achievements you’ve unlocked per game and what you have left to work on."
That is a lot of games on the screen! Look for more information on the NXE as it is released.