Microsoft unveiled a number of significant upgrades to its Xbox 360 platform with the latest Xbox LIVE Update. While the update is available today, a few of the new features won’t be available until tomorrow, August 13th. Here’s a quick look at what you can look forward to with the update. Games on Demand Starting tomorrow, you’ll be able to browse and purchase games through the Xbox LIVE Marketplace. New game titles will be added every Tuesday, and your game licenses will be linked to your Xbox LIVE account,