Zelda series producer Eiji Aounma credits fan speculation for the creation of a female Link in the recent Legend of Zelda: Hyrule Warriors 3DS game, but he clarified to Kotaku here at E3 that the Link in the new Wii U Zelda
who first showed up in a 2014 trailer was always planned to be a guy.
Source: Kotaku – Zelda Producer Explains Why, Despite Speculation, The New Link Is A Guy