This means we’ll lose cards from March 2021’s Battle Styles through November 2021’s Fusion Strike. You can see a list of important cards we’ll lose on JustInBasil.
Only cards with an “F” regulation mark or later will be allowed for tournament play. This means most cards from February 2022’s Brilliant Stars and later will remain legal.
Temporal Forces becomes legal April 5th, which is why rotation will occur then. It will be the first set to contain “H” cards.
For Pokemon Trading Card Game Live, rotation will occur two weeks earlier on March 21st. This is the same day Temporal Forces will be added to the game. This will allow online players to test the new format ahead of in-person events.
No changes were announced for the Expanded format. However, it appears the format is being neglected by TPCi. Organizers haven’t been able to sanction Premier Events under Expanded since before Covid. The recent Scoop Up Net ban for Japan’s Expanded format also hasn’t been announced overseas.
(This news story was so predictable I wrote it word-for-word two months ago.)