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"We appreciate the outpouring of support from the gaming community, and hear the request of fans to honor him in a future game. We will not be discussing what might be possible for future games during this difficult time, but we will hold our memories of Robin close."
http://www.gameinformer.com/b/news/archive/2014/08/16/nintendo-responds-to-fan-requests-for-robin-williams-to-appear-in-future-zelda-title.aspx