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MultiVersus launches sign-ups for closed alpha testOpen beta planned for July
Open beta planned for July

Here’s the trailer:
MultiVersus | Official Cinematic Trailer - “You’re with Me!” | DCWatch on YouTube
MultiVersus | Official Cinematic Trailer - “You’re with Me!” | DC

If that looks like something you want to play as soon as possible, you can sign upvia the game’s official site. You’ll need to create a (free) WB Games account if you don’t already have one, and you’ll need to say what platform you want to test it on. The alpha launches this Friday, May 19th.
I am broadly in favour of there being more platform fighters, however, particularly given the relative paucity of them on PC. MultiVersus has other interesting elements, too, including being designed primarily for 2vs2 matches (although solo play is supported).
MultiVersus be free-to-play when it launches, and the current plan is for the open beta to launch in July.