This is how, usually,2k hires for Bioshock, but it could perfectly be another project, although, when one remembers, back in 2011 Bioshock Vita was announced. Kevin Levine said that Bioshock Vita would begin its development only when Bioshock Infinite was finished.
I know, Bioshock Vita it’s not an “unannounced” title, but the title was presented 2 years ago and only a logo was shown. We have seen absolutely nothing more about the title.
In any case, stay tuned.