In my opinion, they have plenty of material or demos featuring Emily ready to be reworked - after all, they were already working with her in secret, behind the scenes in the studio, a few years back. They’ll probably take a break now, then start sorting through that material in the spring, and I reckon the new album will drop in early 2028.
As for the sound, that’s obviously a mystery. I’d love a From Zero Part 2, but they might come up with something completely different. Shinoda, as we know, is full of surprises!