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.