According to media reports, the Irish Data Protection Authority intends to Prohibit data disclosure from Ireland to the U.S. within the Facebook group. It shall have sent the draft of a corresponding decision to the other European data protection authorities for their comments, in the procedure pursuant to Art. 60 GDPR. If another authority raises an objection within four weeks and if the Irish authority nevertheless sticks to its decision, the EDSA has to decide (Art. 65 GDPR).
Further information can be found at Politico, at the IAPP and of course at NOYB.