full article here: http://kotaku.com/in-japan-xbox-one-loses-another-game-to-the-ps4-1632333372
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Within the last hour, however, it appears that Xbox.com is no longer hosting the Batman Arkham Knight page. Why would it? The game is now a PlayStation exclusive in Japan, according to popular Japanese game sites like Famitsu and Game Watch Impress.
When Game Watch Impress asked why Arkham Knight became a PS4 exclusive in Japan, they were told "no comment."
Of course, the game could be a timed exclusive and maybe get released on the Xbox One when it has a larger install base in Japan.
This isn't the first multi-platform game to become a PlayStation exclusive in the region. In June, it was announced that Destiny, a multi-platform title in the West, would be a PlayStation exclusive in Japan.