Among them are Black Widow, Eternals, Death On The Nile, Shang Chi and the Legend of the Ten Rings and West Side Story, most of which have now gone into 2021 which at the moment seems like a safer bet.
Black Widow starring Scarlett Johansson has changed to May 7th 2021 and is perhaps one of the biggest to have a change, this could still see a debut on Disney+ if things don't improve quick enough.
West Side Story from director Steven Spielberg has gone on a whole year to December 10th 2021, this originally set to be a big 2020 holiday movie and Oscar contender.
Interestingly Denis Villeneuve's adaptation of Dune which was set to be released the same day has not (yet) moved from December 18th 2020.
Death On The Nile has moved to December 18th 2020, not into 2021 yet but it is the same day as Dune and (which I'm sure will move) and long awaited comedy sequel starring Eddie Murphy, Coming 2 America, although with no trailer or poster yet this will move to same time in 2021 at some point.
Eternals, another Marvel feature, has moved to later in 2021, November 5th, and also from Marvel Shang Chi and the Legend of the Ten Rings has changed to July 9th.
With the UK about to go back into some kind of lockdown the state of cinemas is looking as uncertain as ever, it is being suggested that Tenet's box office was effected because Warner Bros. opened the movie when people were simply not ready to go back to the movies.
There needs to be a breakthrough in overcoming the virus and cinema chains regaining the trust of the public before things will truly recover and that could be more like the end of 2021 in reality.
Source of much of this story @GiteshPandya on twitter