Currently waiting on the Park Service. A judge ordered NPS to suspend implementation of the new rule, which means they returned to the old rule (no guns). NPS has supposedly started the environmental impact study that was missing from the implementation of the new rule.
Of course, they did include in the rulemaking process their finding that no environmental impact study was needed, because there was no plausible environmental impact. That's all the law requires (either a study, or an explanation of why one isn't needed), but the judge didn't care.