The last event where you could earn a new mount ended on November 8th. It required completing the Dark Citadel before 6:00 PM on November 8th. I did not receive the mentioned items, only those given for completing the dungeon.
I have put the head already on the altar in Kurast bazaar further down below the lion statue to change the difficulty and I just received the treasure for completing the dungeon and no mount droped on the floor.