While I'm curious about the previously skipped 12 chapters worth of events, I really hope that when the story concludes, it manages to bring everything back to the start and tie off loose ends, such as with the separated couple whose baby died in the earlier chapters, the perfect score guy who is currently his assistant in university, etc.
After all, it's not just about the story of Sherlock and William, of equality and the caste system. It's also a story about how these perpetrated events affected all of London and its people, this, of course, including the Moriarty household as well as Sherlock's friends and family.