Yes, she might be. JK Rowling has been quite creative over the years. Given her past success with the Harry Potter series and other works, it's very likely that she is exploring new story ideas. However, as of now, there may not be an official announcement regarding a completely new story.
Yes, they are official. JK Rowling is the creator of the Harry Potter universe, and any new stories she releases are considered official additions to the franchise.
JK Rowling has been involved in new stories that could potentially include more about the magic system in her fictional universe. Maybe new spells, magical creatures, and how they interact with the human characters in the wizarding world. For example, she might explore how different magical creatures contribute to the overall balance or chaos in that world.
As of July 2023, there were no official announcements of a brand - new Harry Potter story directly from JK Rowling. However, she has continued to expand the Wizarding World in other ways, like with the Fantastic Beasts series which is set in the same universe.