Flintlock weapons - Slow reload, high damage, fairly expensive ammo
I don't like guns but a step forward from bows sounds cool.
Also maybe crossbows, I doubt it would happen, but maybe.
Magic, too. Because we're getting like mystical things like enchanting and potions I believe magic would be necessary
EDIT: Just thought that maybe different types of bows, because a cheap bow doesn't feel right in your set of diamond tools.
Maybe different arrows too?