My friend and I were anticipating for Kel'thuzad or Zul'jin respectively as they've been confirmed to be in development for a long time now.
Honestly I'm sad neither got announced especially because Lunara doesn't even exist in the main warcraft universe, however she is made up with a hero design that suits the Fantasy that is a Warcraft Dryad where she has solid dps and utility at the same time which may be why they're releasing her after the announced Greymane and Cho'gall who also have unique skillsets.