Heartwarming / The Shattering: Prelude to Cataclysm
Garrosh receives his father's axe, Gorehowl, from Thrall. It's a poignant moment, and makes you wonder if it would have been like that if Grom had given Garrosh his axe instead.
Anduin and Varian's reconciliation
Anduin: See Father? You knew exactly the right thing to do. I knew you did.
Varian: I needed someone to believe that for me, before I could. Come on, Son. Let's go home.
Aggra comforts Thrall as he believes that his decision to leave for Outland resulted in Cairne's death, telling him that his decision is best for the world and that she wishes to accompany him to Azeroth.