One of the biggest mysteries since season 1 were what are the Druids, and what do they look like, and where does Haggar get them from. There have been many speculations from corrupted Alteans to Lotor clones to dead Alteans revived and used by our favorite necromancer Haggar. It seems like the show is finally going to answer it now that Haggar is seemingly in control -of even Sendak I bet- as the trailer implies the Galra have new weapons and s5 reference to Sendak being her puppet. 

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The Druids have specific cuts on their arms, and now bandages, that the person Keith fights has as well, so it’s very possible to Haggar is creating them now faster than ever, be it from the Altean colony Lotor left behind with thousands of corpses or other methods. There seems to be an army of them now so their production must be urgent and clumsier. Perhaps it has something to do with this shot 

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Look at the mark on the man’s forehead, that says an interesting story all on its own.