Health agencies working under Robert F. Kennedy Jr. are making changes to the nation’s decades-old system for approving and recommending vaccines. The shift comes despite a pledge by Kennedy not to upend U.S. vaccine policies. The Food and Drug Administration is expected to soon unveil a new framework for regulating vaccines. It will be overseen by an official who has been an outspoken critic of the agency’s approach to COVID-19 shots. Meanwhile, Kennedy appears ready to bypass an influential advisory panel that makes recommendations on vaccinations. It’s all clouding the outlook for new shots for COVID-19 and other diseases, including which ones might be available this fall and winter.