Doctor Who will likely explore some bit of the Timeless Child mystery, and hopefully uncover that “great lie” the founding fathers of the Time Lords passed down.
It’s a great question, as while the Master assured the Doctor the answer would anger her just as much as it did him, he wasn’t about to make things easy for his old rival.
The Doctor will have to search for answers herself, and given that the “fam” (Ryan, Yaz, and Graham) is finally demanding questions about her past, it looks like Season 12 will explore this question in depth.