While scrounging through some rather large ruins I found a couple jumps from Sol, I recovered a Research Lab with technical details for "Advanced Particle Beam Warhead 3". This is a new one on me. I can now further research this tech under Energy Weapons, but it doesn't actually seem to allow me to design or build any weapons systems related to this tech.
Is this a bug? Or fancy Alien tech? Or some as yet unimplemented tech of some sort?
I also found "Swarm Warrior Melee" tech. This does seem to work and allows me to build Infantry with a 2x melee attack rather than the usual infantry weapons. I envision them as duel-wielding chainsaw warriors. They have come in quite handy in that they don't seem to use GSP. . .