Kobolds as a New Race for players to explore
So, to my understanding, Kobold lore has some issues. Personally, I think their design has some things that need addressing as well, but ironically, both can be dealt with using the same thing. To my understanding, Kobold lore is fragmentary at best, or, at worst, conflicting, unconfirmed rumors masquerading as facts. All we know for sure about Kobolds is that they are giant humanoid rats and have an obsession with candles.
But what if the classic Kobolds we are familiar with in Warcraft are not the originals? What if they're a corrupted splinter faction from the original Kobolds? Kobolds who have a design so different from the classic version that when known races of Azeroth meet them, they actually have some sort of cognitive disconnect upon hearing the species introduce itself as a people.
To be clear, this is more lore theory than anything picked up with context clues; see the line above about lore issues with Kobolds in Warcraft.