Contradicting an earlier claim made by a Ubisoft communications rep, Assassin's Creed: Valhalla producer Julien Laferriere stated that the upcoming PS5 and Xbox Series X title would have a world map that is "probably" larger than Assassin's Creed: Odyssey.
https://www.notebookcheck.net/A-new-Odyssey-for-PlayStation-5-and-Xbox-Series-X-owners-Assassin-s-Creed-Valhalla-set-to-feature-biggest-map-in-the-series-so-far.465798.0.html
I hope they can include Scotland and Ireland, not just England.
They won't be including Scotland or Ireland as part of the map they have confirmed the kingdoms of the time they will have and these kingdoms only covered England. However, we may see a small part in Scotland or Ireland as part of a specific mission.