User blog comment:Ryker61/Bethesda Softworks, LLC cut from list of PS4 developers/@comment-1992639-20130304115753

Most likely Bethesda just did not yet confirm their participation as a developer, or they have no planned titles yet for the PS4. Any Skyrim DLC (if any more are worked on) will ofcourse be for PS3, as I assume it is compatible with PS4 also.