According to a statement from Microsoft, Grand Theft Auto 4's future DLC will include "exclusive Grand Theft Auto IV episodes that will provide hours of additional game play."
Currently, there are no details on pricing or gameplay for the upcoming downloadable content.
For all you Prince of Persia fans, it looks like the 2008 Holiday season is your lucky day(s). Ubisoft has announced that they will be releasing a new Prince of Persia game, simply titled "Prince of Persia". It is currently in development at Ubisoft Montreal and is looking to sport a new control scheme and illustrative style.