So A&E will contain new game mechanics for handling gun fire? I don't own the MRQ2 core book yet. So, I'm not sure what it contains in regards to gun use. Unlike hand-to-hand combat, it's possible to simultaneously move and attack (i.e. fire a gun) at the same time. Do the new rules take this into account? Will there be rules for automatic weapon fire or explosives?
Don't get too carried away

... these aren't rules for
modern weapons, but hand-loaded black-powder weapons (try running and firing a musket... or an arquebus).
So, no. No rules for automatic fire of explosives.