Compared to live, Unload will receive a minor buff in 2.0. That is because Advanced Targeting (Tier I Pyro tree), which both Arsenal and Pyros will select, has its effect apply to Unload as well as Rail Shot. In 1.7, Advanced Targeting applied only to Rail Shot. It is a minor effect, adding 5-8% damage to Unload depending on how much armor the target has.
Unless it's bugged, Advanced Targeting already applies to Unload.