Well, we already were pretty clear on the Titans not exactly caring about mortals and being perfectly willing to manipulate them to their ends. So that doesn’t seem like much of a twist… but it will certainly become more of a topic, as soon as someone actually starts engaging with the Primalist arguments.
And I feel like that story might be more about coming to terms with Titan nature and shedding the leftover reverence, rather than about actively rejecting them. As the lore is set up, rejection just isn’t much of an option. Titan’s might not be the benevolent originators, but the peoples of Azeroth, including the dragons, are very much formed by Order, and thus share a lot of its interests.
The ressurection of Tyr will probably become a turning point. Either we’ll learn that even the revered Tyr was a mean, propagandist butthole, or we’ll learn more about Titan politics and different factions among orders’ servants, to align with one. Either way, Tyr’ll point us towards the next big threat.
Murozond is another story that can go multiple ways. Nozdormu is certain he’ll become Murozond at some point… but that is only because he is specifically guarding the timeline the Titans want to happen, where this happens. If he were to defy the Titans’ plan, there actually is no reason for him to become Murozond. He is only fated, because he guards fate. One way or another, Nozdormu’s plot is about defying fate. So we really can’t take his visions of the future as given.
Which is also where the Old Gods, who favour unlimited possibility for the future. They have already been hinted at at a few points this addon, and the Odyn-files suggest that we have more to learn about the Black Empire. Our knowledge is pretty much limited to our Ny’alotha visit and Odyns propaganda, and an addon with prominent time-travelling dragons is a good point to dive a bit deeper.
Apart from that… I don’t really think we’ll see Deathwing or Galakrond again, but we might have a re-do of one of their stories through the primalists. We still have 3 primal incarnates to go, and either could take on decay and start chomping up power, or go the outside corruption route like Deathwing, and ally with the OGs. Especially Iridikron.
At this point I don’t see the sword or ressurection of dead dragons playing a big role, but I have to add the Night Elf plot to the things I expect them to tackle. We already had a questline where they deposited the “seed” in the emerald dream, close to a portal to the Dragon Isles, where a suspiciously spacious patch of enclosed water is waiting. So yerah, they’ll grow the seed into a tree (or at least a sapling) at some point, and that point will be within this addon.