Truthfully I don't think we have another subclass coming, Prismatic very much seems the capstone of subclasses. And that's something worth considering: if a new subclass came out, would it be added to Prismatic? How could you justify it not going to prismatic? Would this new subclass get its own weapon type? But we've already got 3 types in each slot! (And all 6 in heavy.) So we'd need a subclass that is not of the light or of the dark, and either doesn't get its own weapons or can in some way steal or borrow from the existing weapons (somewhat like prismatic). Kinetic subclass! Already have the guns and grenade. As for what exactly a kinetic super would be, I have no idea. Airstrike? Orbital Cannon? Call in a Tank?