A facebook group called Jedi Templo Aztian have posted new images that give a glimpse into The Last Jedi.
Executioner Stormtrooper These guys uh, execute stuff? They look cool, but I think we're running out of names. What's next? Janitor Stormtrooper?
Elite Praetorian Guard This image matches very similar to the drawing created over at Making Star Wars. I believe this is one of 5 or 6 different Elite Praetorian Guards as Jason's description mentioned similar body armor, but different helmets.