While the developer, Qumaron, originally suggested a release in early 2020, community updates from May 2021 indicate that development did not proceed and the series was likely discontinued. Steam Community Background on Previous Seasons

Since Season 3 remains unreleased, perfecting the first two games is the best way to get your fix:

As Rome tightens its iron grip on Britannia, a fragile alliance of Celtic tribes must decide whether to fight, flee, or betray their own gods—while a young Roman tribune discovers that conquest comes at the cost of his soul.

The producers have invested a record $15 million per episode into Season 3. That money is visible: