If Microsoft follows the same schedule it did last year, the Spring system update for the Xbox 360 should be right around the corner. Today, an alleged and wholly unconfirmed list of changes included in the "Q2 2008" update was sent to us, supposedly forwarded from an internal source. The full list—which is after the jump—features about 80 new feature additions, tweaks and changes but was purported to be incomplete and subject to change.

Some are simply interesting as curiosities, such as an option to purchase Xbox Live memberships for charities and the addition of a Media section for audio delivered through feeds, such as podcasts. Others sound more feature robust, such as Windows Live Mail integration and an expanded "Inside Xbox" with news, weather, entertainment, help and community features.

Perhaps the most interesting additions are "Calibration options for motion sensor devices" for the Dashboard and "Support for titles to store installation data on Storage Device for faster loading" for Games. If true, the former would lend further credibility to frequent rumors that Microsoft is planning to introduce a motion controller for the Xbox 360. The ability to store installation data on a hard drive—as is done with some PlayStation 3 games—would certainly be a welcome option, if that's how the wording should be interpreted. Continue on for the full list of rumored updates.