It feels like we’ve been waiting a while for Batman: Three Jokers. We have to be patient since it will be a pretty epic story. Back in March, DC announced the first issue would be released in June. Obviously things have happened that are causing delays. Again, we have to be patient. Plus, this just means we’ll be safe from finding out the truth about Joker for a little longer.

You can read about the lead up to this story and the first revelation of there possibly being more than one Joker here.
SVP and Editor-In-Chief Bob Harras said this about the delay:
“As more stores are finding ways to operate and service their customers, our release schedule is under constant review. From placing orders to on sale, moving Batman: Three Jokers to August will enable more stores to order and sell this incredible story that Geoff and Jason have crafted.”
Batman: Three Jokers is a 3-issue, 48-page (per issue) prestige format monthly limited series by Geoff Johns, Jason Fabok, and Brad Anderson released through DC’s “Black Label” (for readers 17+). The first issue arrives in open and operating comic book stores and participating digital retailers on Tuesday August 25, 2020.
