By 2 dozen new guns he is referring to the guns and their alchemy lines, right? So in theory, if this equipment is starting from 2 star and going to 5 star, like most equipment, there will 5-6 alchemy lines. As a gunner, I am curious if there will be 24 new end-game guns or much much less.
it's counting alchemy lines. You can check the testing forum if you want to see what they are.