While those definitely look to be Phase 2 or 3 Dark Troopers in the final scene of The Mandalorian: Chapter 12, it's pretty much a given the series won't be following the Expanded Universe's ...

Featured as a pet project of Moff Gideon (Giancarlo Esposito), the Dark Troopers had a similar origin ... suitable for use — including a final phase that involved a trooper made entirely out ...