Open World BioShock Plans

Developer Cloud Chamber has posted several job listings for the next BioShock game (thanks PCGamesN). These postings include a UI/UX Designer, a Senior World Designer, a Senior Technical Designer, and a Senior Writer. That last listing in particular has a point of interest, as it reveals the next installment in the series will apparently use an open world setting:
Cloud Chamber is looking for a Senior Writer to join our talented Narrative team to bring the world of BioShock to life once again. Under the supervision of the Lead Writer, and collaborating closely with the Narrative and Design teams, our Senior Writer will craft memorable narrative arcs, write dialogue, and breathe life into our characters. Experience in writing for games, with a particular aptitude for managing the nuances of interactive storytelling, would be ideal for this role. We’re hoping to find someone who can weave impactful, character-driven stories in an open world setting.