IBFD evolved on the vanilla setup by having retaining the Romano-British emergent faction and converting the ahistorical "Celts" (an uncomfortable blend of the Pictish and Gaelic/Goidelic cultures) into a Pictish faction.
As I understand it in the next major update the Pictish faction will be removed (ie. Pictland will be powerful rebel territories with the Pictish units in the current build) and replaced with a Gaelic faction based in Ireland. I don't know whether they start with lands in Caledonia, but as they are supposed to represent expansionist, naval-orientated Gaelic rulers like Niall Niogiallach they would presumably attain some quickly anyway.
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