The Last Kingdom challenges players to control 13 new factions, including the Vikings themselves, the Saxons, Scots, Irish, Welsh and Norman, and to embark on a campaign to dominate the British Isles. With a wealth of new historical heroes, players can lead a range of new units into battle - including Viking Berserkers, Saxon Huscarles and Fyrdmen - while conducting sieges and epic battles. You can conduct the campaign on a new map focusing on North Europe, in the continent, in the Isle of England or Iceland or starting from the Norwegian peninsula.
Edit as of 2022-04-04 - Alba has a new mounted unit shared with the Kingdom of the Ui'Neil.
The Kingdom of Alba is still using the old roster that they used to share with Gwynedd, but they do get six new units - three from the WotW Scotland faction, and three older units by Absinthia.
New units still not balanced.