Other than the next 4 announced Arcade games for this Summer:

Cloning Clyde - 07/19/2006, 800 Microsoft Points
Galaga - 07/26/2006, 400 Microsoft Points
Street Fighter II: Hyper Fighting - 08/02/2006, 800 Microsoft Points
Pac-Man - 08/09/2006, 400 Microsoft Points

Could we be seeing an additional 4 Arcade games? A "Gamespot Gold Experience" trailer, a video of "Summer of Arcade", is now available to download from the Xbox Live Marketplace. While I have not personally taken a look at it , it is being said (By Greg Canessa, I assume) that they claim to have a total of 30 Arcade games by the end of Summer (09/23/2006), and another 20 titles on top of that to make 50 by the end of the year.

Just to throw a bit of hope out there: The last time a 'goal' was announced, which was 20 Arcade games by March - It was met. But we know to take all information with a grain of salt, right?

I know, I know... it is a slow news day. But, go ahead and take a gander at this video, and tell us what you think.