The FDA released a statement after the meeting they are recommending a monovalent (just 1 strain) COVID fall vaccine booster based on the XBB variant lineage of Omicron with a preference for XBB.1.5 ( https://www.fda.gov/vaccines-blood-biologics/updated-covid-19-vaccines-use-united-states-beginning-fall-2023 ).
With flexibility given to vaccine manufacturers it will be interesting to see which formulas are actually available for the fall booster from each company and when. 31/