Someone has been doing some detective work and found links for Krennic and the Death Trooper expansions on the FFG site which should be enough to confirm them.
Tabletop Oddity wasn’t the one who find the links but he has an awesome video giving some good evidence that Krennic and the Death Troopers are the next wave after Jyn and the Pathfinders.
Video can be found here: https://youtu.be/LU800mUErww