http://www.insidegamingdaily.com/2012/08/15/gamescom-2012-dayz-dev-in-talks-to-come-to-consoles/
http://www.videogamer.com/pc/day_z/news/bohemia_wed_be_stupid_not_to_release_dayz_on_xbla.html
http://www.gameranx.com/updates/id/9201/article/bohemia-interactive-we-d-be-stupid-not-to-release-dayz-on-consoles/
http://www.thesixthaxis.com/2012/09/11/bohemia-talk-console-version-of-dayz/
It IS still a rumour at the moment, but if they do go through with it, it'll be the guys behind the Arma 2 game/DayZ mod and not another company. Well, maybe someone to deal with the port, like 4J Studios does with the 360 version on Minecraft but it'll still be Bohemia's work.