Source https://icv2.com/articles/news/view/50243/wizards-coast-pushes-back-magics-unfinity

Wizards of the Coast has pushed back the release of the Unfinity set, for Magic: The Gathering, due to ongoing supply chain issues.
Unfinity, the latest Un-set, was set to release on April 1, 2022 (see “‘Magic: The Gathering’ ‘D&D’ and ‘Masters’ Sets”). The supply chain problems were specific to the Unfinity product line, thus WotC opted to push the set’s release off till the second half of 2022. Additionally, Unfinity promos will no longer ship with retailers’ Kamigawa: Neon Dynasty marketing kits, and will be sent out closer to Unfinity’s actual release date.