There is a vague plan to enable dual wielding, but it’s not going to be an accurate way to fire anything unless you are heavily augmented or mutated and can aim two weapons at the same time.
Dual wielding melee weapons is somewhat more viable, but most dual weapon styles are striking weapon and parrying weapon, possibly with a shift to spare weapon and close combat weapon. You parry with a main-gauche while you stab and slash with a rapier, until you go corps-a-corps at which point you stab with the main-gauche and hope your rapier isn’t in the way.
Dual wielding isn’t currently on the priority list for 0.E, though if someone wants to pick it up that could change.