While there is some new stuff like people pointed out, the majority is just hard reused assets, starting from the animals and races we saw in the clips they showed us aswell as the new class (worgen gecko). Its all the old crap with new paint.
Combined with the serious lack of a major xpac feature (no, some random weird as dragon riding gimmick does NOT count), this seems like a sad excuse for an xpac, especially considering they had / have more time to work on this, covid notwithstanding.