I don't think Black powder weapons would show up. However, magic powered gun/things may well show up eventually. We all know how wars love to push the boundaries of inventions/science in our world, and if you apply that to what is essentially a world war in a world full of magic....
I'd like to see more role-play friendly stuff :D Just, like, really simple things.
Honestly, this idea I've had sounds cool.
Make it where Axes, Daggers, and Spear(PLEEEAAASE) are all throwable. Imagine being able to throw your weapon and picking it up from the source of impact. I would soooo love it for assassin characters :D