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Arthur was killed by a giant cat.*
Arthur killed the cat.
Arthur didn’t fight the cat. Kay did.
Kay and Bedivere use salmon as taxis.
Lucan is half giant, half lion. (This Lucan, Lucano in the original Italian, is evil and not related to Bedivere).
King Arthur raided the land of the dead.
The human knight Caradoc Briefbras has three half siblings: a dog, a horse, and a pig.
A large portion of Arthur’s troops was killed a while before Badon by his nephew’s attack ravens in self-defense. Arthur and said nephew were playing chess at the time and neither did much to stop it. [Edit: before Badon, not Camlann, which has apparently already happened despite Arthur and Mordred being alive]
Merlin retired peacefully and went to live in the countryside with his also-magic sister Ganieda, Taliesin, and another of their friends. [Edited]
Wherever Arthur walks, plants die. They don’t grow back for years.
Arthur had a spunky (half?) brother who died in battle after making a mysterious oath.
Dagonet is more or less able to run the kingdom when Arthur is gone. His biggest error is overspending on mercenaries.
Guinevere has an evil almost identical twin half-sister.
Hector beat up all the best knights except for Galahad while possessed by a demon.
Gawain plays tennis.
Gawain has used a chessboard as a weapon.
Near the start of his reign, Arthur left Lot in charge of the kingdom and went on a quest with a sassy parrot.
Gawain or Galahad succeeded Arthur as king.**
*Whether or not this is canon anywhere is a somewhat meta matter. André de Coutance complains that the story that Chapalu/Cath Palug killed King Arthur and conquered England is a slanderous lie while also implying it's widely circulated. He's saying that it's canon in other places and also that it's wrong. As far as I know, no other text mentions a tradition where the cat kills the king.
**Not in different texts--Bhalbhuaidh is either Irish Gawain or Irish Galahad.