The dates of the next updates of Clash of Clans you are determined by the surprise factor, it is like that, supercell always aims to surprise the users, so it usually does not notify the update date even to the community managers of the social networks.
However, over the years that this game has been between us we have been able to notice a certain pattern. It is that updates usually occur in each season of the year, so it is logical that we expect 4 updates for this year 2022.
These come with scheduled maintenance that is leveraged to add updates.
The theme of the update is subject to the events that take place in the season, for example, if a world tournament of Clash of Clans, they are not going to suddenly introduce a character level update or new characters, because that would be a complete disaster.