Direct answer: There is no recent news confirming any new developments about the Cadaver Synod or Pope Formosus’ posthumous trial; coverage on the topic remains historical or contextual rather than current events.
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In 864 Formosus was made bishop of Portus. He did missionary work for the Bulgarians who then asked that he be made their bishop. This was forbidden by the Second Council of Nicaea and so Pope Nicholas I denied the request. In 875, he convinced Charles the Bald, who was…
historycollection.comFormosus, pope from 891 to 896, whose posthumous trial is one of the most bizarre incidents in papal history. The politically motivated trial found him guilty of violating canon law and declared his election as pope invalid, though his papacy was reinstated by subsequent popes.
www.britannica.comIn 897, a bizarre event known as the “cadaver synod” occurred in St. John Lateran’s in Rome. The disinterred corpse of Pope Formosus was brought before the then-reigning pontiff, Stephen VI, to be tried on a variety of charges.
www.catholic.comReigned 891-896
www.newadvent.orgIn 897, the new, Pope Stephen VI, held such hatred and animosity toward his predecessor, Pope Formosus, that he put him on trial in Rome. One small detail, Pope Formosus had been dead for 7 months
lost-in-history.com