The DC FanDome's Multiverse 101 panel offered a number of exciting reveals about the DC's on-screen universes, as well as some groundbreaking news about The Flash.
Producer Greg Berlanti revealed the Ezra Miller cameo in "Crisis on Infinite Earths" will lead to more future film and television crossovers in the DC Universe.
In addition, Jim Lee confirmed that Ezra Miller's version of Barry Allen will call himself The Flash. This follows his meeting with Grant Gustin's version of Flash in "Crisis on Infinite Earths."
According to Lee,
"Ezra's Flash was never named 'The Flash' in the movies. He got his name from meeting Grant... That's so cool to have that introduction into the canon!" We had track down the costume for Ezra and luckily it still fit!"
Further clarification about the multiverse was revealed during the panel as well. We now know that Wonder Woman, Aquaman, The Flash, and the other Justice League characters to appear in the DCEU exist in the same universe at this time. However, the version of Batman in The Batman exists on a separate Earth in a different universe from this beginning Justice League. Also, the Joker is not on Justice League's or The Batman's Earths.
In the following panel for the The Flash, the director of the live-action Flash solo film starring Ezra Miller explained that the film is "also a time travel story". The film is currently scheduled for a June 2, 2022 theatrical release.
WHAT THIS MEANS
The Flash solo film has had a troubled production so far, but it now seems the film is on track and has both a clear and fascinating direction with major implications to the DCEU, particularly in regard to exploring the multiverse and the addition of Michael Keaton reprising his role as Bruce Wayne.