Kadokawa Games said Killer is Dead would come out this summer. Famitsu has a clearer release window – August for Japan. Xseed which will publish the game in North America and Deep Silver who has the European rights says Killer is Dead will be released in the West this summer too. Perhaps, Kadokawa and the two other publishers are coordinating to give Killer is Dead a worldwide release like with Lollipop Chainsaw.
For more about Killer is Dead check out our interview with director Goichi Suda from Grasshopper Manufacture.