Season 4 is already here for Multiversus, Quoth the Raven

Warner Bros. Games is adding two more characters to it's free to play platform fighter madness. Raven of the Team Titans, daughter of Trigon is the first to be showcased and given the grand reveal treatment. Billed as a Mage, she is able to use Dark Magic and telekinesis, and also project herself out. She will be available November 12, 2024, with character variants based on her character. 

In addition, Adventure Time's Vampire Queen Marceline will also be added. You get a glimpse of her in the trailer, though there was no specific date give for her. Multiversus will also add an Arena mode, which seems convoluted in my opinion. It's slated as 2v2v2v2, or via rounds. Winners get in game rewards, up to and including prestige (In game currency). Finally, The Back to the Past map from Samurai Jack will be there on release day, while the Candy Tavern map from Adventure Time will be released later. Check out the trailer below.