Sony has now officially announced an event for its Xperia line scheduled for May 11. This will be a product announcement event that will likely see the flagship Xperia 1 IV and mid-range Xperia 10 IV unveiled but not launched on the global stage.
https://www.notebookcheck.net/Sony-Xperia-1-IV-Sony-schedules-a-May-11-event-presumably-also-for-the-Xperia-10-IV.615859.0.html