We didn't know about World Quests or Mythic+, just vague "we will do something to make it relevant". Also no profession (this I don't remember 100%) and for sure no word about new transmog system.
Both reveals lasted 1 hour, in Legion we didn't have talk about Classic, but there was live audience that always fill some time. Biggest difference is that DF focused on zones and systems, had CGI trailer, while Legion focused more on story and smaller bits - here few DH spells, here few artifact weapons, etc.