I like idea of upgrading weapons but I think that is work for some kind of magician (Enchanting weapons) or blacksmith (Sharpening weapon, weighting and balancing weapon, that kind of things)… maybe magmasmith will do such things? In concept art he wears gloves with runes, maybe he will be able to add runes to weapons?
As for unlocking new things, I think that another class with only concept art - engineer - could do such things. But, again I don’t have any idea if that is what devs are planning.
And by name ,Scientist" I immediately thought about planned class that i have seen at wiki - Physician. Also I think that herbalist will be promoted to alchemist, another planned class.
Here is a link to the topic, where poeple found new classes in game files and a link to wiki where are listed planned classes. (I just don’t know how real are these classes on wiki 
)
http://discourse.stonehearth.net/t/expansion-of-the-class-tree/7715/2?u=wiltedragon