Season 22 ends on Sunday, 28th March.
Non-emergency patches are applied to live servers on Tuesdays (Pacific time).
First Tuesday after Season 22 ends is Tuesday, 30th March.
Blizzard leave at least a week between patching and the next season starting.
Seasons start on a Friday and the first Friday that’s more than a week after 30th March is Friday, 9th April.
Hopefully this also means we should see final patch notes for 2.7.0 / S23 next week.