So we know from Wowhead that Khadgar will be a big character in Dragonflight. And I discovered something in Hearthstone that makes me think Khadgar may be revealed to be a dragon.
For the new Hearthstone expansion, if you purchase the Tavern Pass, you can unlock a mage hero portriat of Navigator Khadgar. When you start a game with him, it has a special animation before the portriat locks into the board. When it locks in, there are a pair of flaming black dragon wings that spawn for a few seconds behind the portrait.
And Blizzard does hide spoilers and teasers in Hearthstone that are about later WoW expansions.
Khadgar also tends to stick to frost magic and using Atiesh’s raven form. So to have flaming black dragon wings associated with Khadgar is very out-of-character.
So yeah, I think Khadgar is a dragon. Possibly a black dragon.
I know I could be 100% wrong. I love lore speculation, and I have played Hearthstone since beta. There are little things that Blizzard hides in Hearthstone that can hint at later expansions.
And it could be a bug. But again, I love speculating.