Courtesy of another beautiful, dedicated tumblr fan (smallhirodork @ tumblr), you 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 search "ベイマックス" on Disneystore, showing all of their products. When their December release date gets closer, and they create a page, I will link to that instead.