Along with the cancellation of E3 2020, Jason Schreier from Kotaku, who had confirmed the development of Horizon: Zero Dawn for PC (before its official announcement yesterday), revealed that publisher Warner Bros Interactive Entertainment was preparing to officially announce Warner Montreal’s new Batman soft-reboot game (theoretically called Batman: Arkham Legacy, not Court of Owls or Arkham Crisis), along with the new title for Rocksteady and the already leaked Harry Potter RPG, which looks very promising (you may watch leaked gameplay on following link).
More news from me: Warner Bros. Games was planning to do an E3 press conference this year for the first time, to talk about Batman, Harry Potter, and Rocksteady's game among others. Remains to be seen what they'll do now https://t.co/OIry5zgB6p
— Jason Schreier (@jasonschreier) March 11, 2020
Since many publishers and developers prepare to make their announcements through a presentation via streaming, it is very likely that Warner Bros will follow this path.
Publishers like Microsoft and Ubisoft have already started discussing plans to host digital shows now that E3 2020 has been cancelled, while the ESA is considering an online version of the event.