Per the title of this post, it's not exactly "Ultima" or a sequel. As found on the official site's FAQ:
"But is this the Ultima sequel I’ve been waiting for?
This is NOT an “Ultima”, as that is a trademark owned by Electronic Arts. Ultima fans know though, that great RPG’s can be been played anywhere; on earth, in space, in Britannia and in many other lands. I am creating a new land for Shroud of the Avatar, which will adhere to the design principles that all of my FRPG games adhered to."
https://www.shroudoftheavatar.com/?page_id=19
"But is this the Ultima sequel I’ve been waiting for?
This is NOT an “Ultima”, as that is a trademark owned by Electronic Arts. Ultima fans know though, that great RPG’s can be been played anywhere; on earth, in space, in Britannia and in many other lands. I am creating a new land for Shroud of the Avatar, which will adhere to the design principles that all of my FRPG games adhered to." https://www.shroudoftheavatar.com/?page_id=19