Nothing is for certain yet. Datamined info is low right now.
There are some Datamined Baandari crown crates and 2 Seasons of "Crown Crate Classics/Greatest Hits" crown crates, as well as a couple Elsweyr assets. There's several mentions of Elsweyr in dialogue in Murkmire.
However, there's also the Riverwood Hen crown store pet that has a background that looks like Riverwood in ESO is already made, and I hear recently (within the past few updates), the area around Winterhold has a line around it now if you go out of bounds, which could indicate it being a zone separate from Skyrim?
Many places, though I spent most of my years in the friendly cities of Elsweyr. It was there that the name Hands-That-Heal was gifted to me, due to my magical skill.\n\nAnd then, after many long years, I made the choice to come home."
"Kazrala may not have a lifetime, but … it would be quite the thing to learn, no? An amusing trick to bring back to Elsweyr, if nothing else.\n\nHmm. This one will keep trying."
"I may be used to handling dirty items, but it seems every inch of Murkmire is covered in mud. If only I could return to Elsweyr ….\n\nOf course, I would be executed immediately if I did. So it is a life of swamps for me."
"In Elsweyr, I was a philosopher. In Murkmire, I am a fisher. These professions are not too different though, no? Still I stand for long hours with nothing but my thoughts."
"Clean up this mess! This isn't Elsweyr, you know."
"We were business associates. I would buy her saltrice crop and sell it in far-off Senchal. The cats like to put moon-sugar on it.\n\nWhen Keema-Ru fell on hard times, I offered a loan. Unfortunately, she died before it could be repaid."