According to the magazine and proven NeoGAF proxy SuperSonic 1305, the PlayStation 3 port will pack improved visuals over the previous PC and Xbox 360 editions along with the previously-released free downloadable content.
When reached for comment today, 2K Games told Shacknews it had "no comment" on the matter. A PlayStation 3 iteration of BioShock was denied by creator Ken Levine last August, though his phrasing only indicated the studio was not pursuing a PS3 version at that time.
EGM's writeup further states that the upcoming BioShock 2 will be unveiled around September as well. No platforms have been announced for the 2K Marin-developed sequel, though PC, PlayStation 3 and Xbox 360 editions are expected.