Series will premiere July 2024. The new PV is here. Source is the official twitter account. Synopsis from AniList:
Deadly crazy party of the baddest villains land themselves in ISEKAI!!! The most dangerous & bizarre fantasy adventure unveiled…!!! DC’s Harley Quinn and The Joker have been ISEKAI!? Suicide Squad rampages onto the stage of ISEKAI! A new original animation from Japan! The most maddening worlds collide in an epic and violent fantasy with the strongest line-up of creators!
Edit: ANN article for additional cast/staff information.
Wait what?
That was my reaction back when I first saw the announcement. I have no idea what to expect from this one come July.