According to the latest issue of Famitsu, Tecmo Koei’s & Nintendo’s Dynasty Warriors/Zelda mashup/crossover game is scheduled to be released in Japan on August 14th. A western release date has not yet been announced thus far, but may be announced at E3 next month.
The same issue also revealed that Team Ninja is assisting with development of the game. According to Siliconera, Hisashi Koinuma and Yosuke Hayasahi will be producers for Hyrule Warriors. Eiji Aonuma, the producer of the Zelda series is working in a supervisory role.