You probably wont see additional weapon types you may see appearances added for those weapons overlaying an existing weapon well personally myself I think the 3.5 weapons system was far better than the 5e weapons being simplified. I doubt you would see it implimented in balders gate 3. Maybe when 6e comes out as a large amount of the community has expressed they find the weapon system rather lack luster. Some of the aspects to weapons in 5e are good but most of the basic concept to it is lackluster in its lack of diversity. You probably wont see it fixed outside a cosmetic change. Maybe with a patch dlc or a mod.
