A very interesting take ! I like that you kept the mystery of Azeroth's whereabout, a thing that Blizzard kinda sucks at now. I would have gone for a more direct approach, I think. Un'goro and Uldum are pretty good elements to deal within, since they are both Titans facilities and it's a fine idea to deal with the sword in Silithus too !
I also entirely with the idea to revamp zones gradually, makes it less of the hassle and allows more care for each one !
New Class and New Races are always welcome, especially those who have been asked for so long ! I might go wild on that point.
I didn't know about the Ishgard Restoration at all, but your planning and gameplay for the rebuilding efforts seem very well-thought, and I don't think there's much different ways to handle that. I too would have started with Gilneas xD
First raid seems enticing, delving into the Heart Chamber facility is a good starting point to make the connection with BFA events.