Beware of unmarked spoilers.
Yoruichi will use her cat form to help the PMMM girls.Specifically, Yoruichi will present herself to Madoka and Sayaka, maybe even Mami and Kyoko, as a faithful version of the Mentor Mascot that Kyubey inverts, in order to turn them away from the incubator and convince them of the real situation.
- This could, of course, have repercussions if the girls themselves find out that Yoruichi isn't who she says she is, should she go this route. Perhaps leading to a timeline reset.
Homura will get adopted into the Kurosaki family by the end
- Confirmed(?) Though it has not been made official, it has been stated multiple times by multiple members of the Kurosaki family that they consider Homura to be their sister/daughter.
Yhwach is the master of the IncubatorsThe two have fairly similar goals: Creating a world without death and staving off entropy, to the point where the two would align fairly well, and Chapter 77 has Kyubey reveal in an internal thought process to have a master. Said master could very well be Yhwach, who Yamamoto seems to have actually defeated in the past...and yet is still causing Soul Society trouble.
Toshiro will die in the N + 1 timeline.Or something else horrible will happen specifically to him (because this is PMMM and characters suffering horribly is a given). Toshiro has been focused on a lot this timeline and Kyubey sees him as a major threat and obstacle. Sayaka nearly contracted to save his life because of Kyubey's manipulations. Toshiro's death, injury, or worse will have major effects on the PMMM girls and his Bleach allies - especially Mami and maybe Homura, who he is close to in this timeline.