Cancellation announcement seems only formality to me, every interested parties already seems to favoring cancellation for so long.
I thought that same and I do think that the T20 world cup will be postponed as the situation here in Australia is now getting out of control. The cases in Victoria where the final was to be played is really spiking so I can't see the world cup going ahead unless they move it to another state like Western Australia where the cases are low and under control. State borders are still closed in Australia and the Western Australian government is pushing to have the AFL grand final played in Western Australia and also the boxing day test match so I wouldn't be surprised if they put forward a case to also host the T20 world cup final and most of the matches. Time will tell on what the ICC decide but its looking unlikely to me that it will go ahead as planned.