There are two small topics i haven't seen discussed yet (unless i'm blind, in wich case, sorry) that i'd like to jumpstart conversation on. I don't know why but small stuff tends to draw my attention like that.
First:
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This is not how an army marches. Not even if they
have to pass through a forest. Could these soldiers be actually looking for something? Like a searching party for a missing person? They seem aware of some danger. Some of them have their swords drown and are actively looking around. But what are they looking for?
Second:
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This is without a doubt Geralts hand, that's forcing something into Dandy's mouth. In fact, you can even briefly see his right hip and the hook attached to it. It's his armor, the same one that's used in the rest of the trailer too. Maaybe he's forcing a cure down his thoat? Or maybe it's a shapeshifter?