While Patch 10.1 adds a new zone with Zaralek Cavern, it will also bring new content to the original Dragon Isles zones in Fyrakk Assaults.
Fyrakk AssaultsThroughout the patch, players will find zones being invaded by Fyrakk's forces, bringing fire and havoc to the most pristine environments of the Dragon Isles. In one of the stories in Embers of Neltharion, Fyrakk plunges into the cavern, finds an ancient molten lava pit to bathe in, and becomes empowered. From that, he kind of flies out of there and starts to wreak havoc on the world, which is where the assaults tie in. They will be similar to Covenant Assaults.
Tyr Questline ContinuesPatch 10.1 will see the continuation of the Tyr questline as we learn more about what happens with him.
Blue Dragonflight QuestlineNew questline covering more about the situation of the Blue Dragonflight. Why hasn't the Dragonflight answered the call of the isles en mass like others? From an interview with Steve Danuser:
Steve Danuser In contrast, we have the Blue Dragonflight story that takes place in other parts of the Dragon Isles. That’s a chance to pick up from where we left off in the Dragonflight chapters. We saw that Kalecgos was attempting to get his flight back together, but he was only able to pull a few pieces in. He felt like he still had a lot of work to do to make their flight feel more like it once did under Malygos long ago. So, we’ll get to adventure with Kalecgos and Sindragosa, delve into the Blue Dragonflight's past, and set a course for its future. That’s a really cool storyline that lets us get out to other places, do some adventuring, and meet other characters, some of which you’ll be familiar with. It was really cool to tell both these storylines within Read more on wowhead.com