One of the hottest anime series this season has been Production I.G,'s Attack on Titan, and for good reason. The tale of humans versus giants is so chalk full of plot twists and brutality that I've actually dubbed it as the anime industry's equivalent of Game of Thrones; as anyone who's seen up to episode five at the very least can attest to. The series' stunning and serious opening credits have been parodied countless times on YouTube and Nico Nico, so it shouldn't come as a surprise that Production I.G. has teamed up with some of the most well-respected video game companies in Japan to expand the universe aside from the usual anime collectibles, manga and anime series.
Based on the success of the Attack on Titan manga, CCG and video game maker Konami announced last year that they had plans to create a mobile, digital card game on 
the Mobage platform in Japan. The social card game is based on the story's premise where mankind must make their last stand against a species of giants known as the titans. Players are tasked with investigating the titans, collecting and strengthening their armies and doing battle. The cards feature some very interesting character redesigns from creator Hajime Isayama's interest in MMA. Based on the company's track record with Yu-Gi-Oh!, fans can rest knowing that it's in safe hands.
Plans for the series first volume on Blu-ray, shipping July 17th in Japan, will include a 64-page prototype manga that Hajime Isayama created when he was 19 as well as a sleeve case by Kyoji Asano, an illustrated card by Flower of Evil's Shuzo Oshimi, and a 12-page color booklet. The most intriguing features to me however will be the mini-visual novels by Saya no Uta and Steins;Gate creator Nitroplus that will be included on volumes 3 and 6 with Isayama supervising and Namaniku ATK providing character artwork. The first visual novel, packaged with volume three, will feature Mikasa's background story featured in the episode "Lost in a Cruel World" and a prologue to Gan Saaku's Levi and Erwin story "A Choice with No Regrets." Volume three will be released on September 18th. Volume six will be released on December 18th and feature Jin Haganeya's story about the characters and Hiroshi Seko's story about Annie. So far, none of these bonuses have been announced for the inevitable FUNimation English release, so we can only keep our titan fingers crossed.
Attack on Titan can currently be seen on FUNimation's website and on Crunchyroll.