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Reason Gravity Rush was chosen:
A list of some other games to have won awards in entertainment can be viewed here:
http://en.wikipedia.org/wiki/Japan_Media_Arts_Festival#Entertainment.2FInteractive_Art_awards
http://j-mediaarts.jp/awards/excellence_award?locale=ja§ion_id=2
Reason Gravity Rush was chosen:
Gravity Rush represents the type of game that should be honored in the Japan Media Arts Festival. The works that appear in today's game market are developed with emphasis placed on refinement, not the discovery of new things. The types of entertainment that games can provide have nearly all been exploited, so how the scenario of a game is handled is what (developers) compete on. However, Gravity Rush is a game that has invented a new form of entertainment: the manipulation of gravity. Not only that, but it's also paired with creative polish that rivals, if not surpasses other titles. The title deftly uses the sensor in the PlayStation Vita, and has been created as a game, not a product. This is a work that has proven that there is still much that can be done in games.
A list of some other games to have won awards in entertainment can be viewed here:
http://en.wikipedia.org/wiki/Japan_Media_Arts_Festival#Entertainment.2FInteractive_Art_awards
http://j-mediaarts.jp/awards/excellence_award?locale=ja§ion_id=2