That's right: not the gameplay nor the cutscenes nor the story. My favorite part of Hyrule Warriors is the ending credits.
[Warning: If you don't want spoilers about the credits of Hyrule Warriors, then read no further.]
At first glance, the credits of Hyrule Warriors seem like nothing special. After all, it's just scrolling credits with random scenes from the game in the background.
But it's not the visuals that make the ending credits worth mentioning, it's the Zelda series' theme song re-imagined as an awesome rock anthem. Don't take my word for it, have a listen for yourself.
Oh, and please note again that the credits video does have spoilers, so feel free to minimize the window while you listen.
Hyrule Warriors was released on August 14, 2014, in Japan for the Nintendo Wii U. It will be released in Europe on September 19, 2014, and in North America on September 26, 2014.