With the addition of Dragonspyre, Grizzleheim was added soon after. A world which progresses with you as you level, calling you back to continue your quest to be the best warrior in Grizzleheim.
In between Celestia and Zafaria, Wintertusk was added. With new crafted gear, fabulous xp, and great drops, it revolutionized the farming methods and the constructed world-hopping path that you take through the Spiral.
My question, however, is that there was a side world added with the first arc (Grizzle), a side world (Wysteria) and an addition to an existing world (Wintertusk) with the second arc. Will there be a new side world/addition added in the third arc, if so, what do you think it will be like?
My own personal speculation is that it will not be an addition to Grizzleheim, although I wouldn't mind, as I love the world, but I just don't think it's realistic or practical. I think it will be a side world, but not one as easy or as short as Wysteria. I think that KI will add another world aimed toward possibly level 75 wizards. Grizzle is accessible at 25, 30, 35, and 40. Wintertusk at 40 with the completion of Grizzle. Wysteria at 25. I think that something in store for 75 or above wizards would be interesting. At 50, you get Briskbreeze and at 60, you get Waterworks and Zigazag, so I think that it's only practical to do something for higher level worlds especially as the level caps increase to (probably) 150 [wow that's kinda crazy]. 75 would be literally mid-game and I think that it would be practical to begin to appeal to the higher levels especially since they already appeal to the below-50s.
That's just my thoughts, but be sure to tell me yours below!