Skirmos blasters to be exact! Here's some more gameplay footage they've released of this new tag system. Disregard the incorrect timestamp, which would suggest this isn't recent footage. The developers of this new system took it for a spin on a FFA match and then later a "Team Slayer" match.
I'm impressed so far with the display information, the RoF, and the level of accuracy and range these appear to be getting. I'm excited to see more and hopefully get my hands on one to review!