Update 5/27/21: This has now been confirmed with e-mails being sent out.
There is a rumor that an internal memo at Hilton has been sent out stating that all free night certificates will be extending until January 3, 2022. The extension is expected to be formally announced on May 27, 2021. Previously these certificates had been extended until August 31, 2021. I suspect this will be the last round of extensions we see unless something seriously goes wrong.
Hat tip to imnion
