Guardians Of The Galaxy Vol 2 Teaser Breakdown: 15 Things You Must See
6. New Aliens?
The black gloves on this mystery three suggest that they are the ones responsible for taking Nebula captive, and the fact that they're being exploded up into the air suggests they're also the same guys who end up falling out of the sky around Rocket and Yondu.
Again, you have to wonder whether these guys are Reavers. It's unlikely they are affiliated with Ego or with Her, given their uniforms, so it would make a lot more sense that they are former associates of Yondu. They certainly have that look about them.
They also have a distinct look of the Kree from the first movie, but there's so much variation in them that they could be any species.