During a meeting with NASA's advisory panel, William Gerstenmaier (the agency's chief of human spaceflight) has pretty much confirmed that the agency isn't working on a successor to the ISS. NASA isn't even thinking of funding the current one beyond 2024 (2028 at the latest), because its new primary goal is to bring humans to the moon's orbit a.k.a. cislunar space. "We're going to get out of ISS as quickly as we can," Gerstenmaier said, according to Ars Technica. "Whether it gets filled in by the private sector or not, NASA's vision is we're trying to move out." The agency has no choice but to leave low Earth orbit (LEO) behind, because it can't afford funding both projects at the same time.