Along with all that, they've got a free download of the World's Finest cards over on their website.
From the preview:
Good news everyone!
We are glad to show you our new SuperMay releases!
Hope you like them as much as we do!
Battle Packs are bite-sized expansions for the Batman Miniature Game, containing new crews, rules, traits, and options. Battle Pack add even more depth to your favorite tabletop game, allowing you to explore alternative timelines, character variants and stories from the archives of Batman, his allies, and his enemies.
The rules presented in this Battle Pack are completely official. Remember, however, that models of the Legend rank may not be allowed in organized play games, such as a Batmatch, unless specified otherwise.
In this Battle Pack you will find new rules representing the characters and events from the iconic World’s Finest mini-series. Here you will find new character cards, representing two powerful teams for the Batman Miniature Game, as well as all the special rules you need to use them.
Battle Pack Source