Courtesy of another beautiful, dedicated tumblr fan (smallhirodork @ tumblr), te can download the entire Hiro's Journal book, which details Hiro's point of view of all the events of the film. Needless to say, major spoilers.
In Japan, the film is called "Baymax" (ベイマックス). This link will cerca "ベイマックス" on Disneystore, mostrare all of their products. When their December release data gets closer, and they create a page, I will link to that instead.