Herbalism
There are new herbs in BC, and some of them will give you a buff, debuff or special item when you picked. Some examples:
●Fel Blossom: Use: absorbs 750 to 1250 damage, lasts 15 seconds.
●Mana Thistle: you gain some mana after picking this herb.
●Nightmare Vine: you take 100 damage per second for 8 seconds after picking this one.
●Some plant type enemies can be harvested for herbs as well.
Mining
Beside the new ores (Fel Iron, Adamantite and the rare Khorium and Eternium), some monsters corpses can be mined after they die, possibly giving up some special materials. Also new is rare (blue) mined items used for rare gem crafting.
Skinning
It appears skinning didn’t really get any changes beside higher level leather to obtain.