untitledjuan
Prince
I'm certain it will be one civ with a leader for that civ. The "new civ and new leader" nomenclature has been used in the marketing materials before for that very typical arrangement.
And personally, I'm rather excited about the possibility of Luisa de Guzman for Portugal that someone mentioned a while back. I'm not entirely certain what her LUA would be, but she was integral in reestablishing Portuguese independence from Spain.
Maybe they could re-use the animations that could have been planned for a supposed Isabella in the leaked photos when the base game was going to be released. Though I do wish they released Isabella of Castile as an alt leader for Spain. I think Charles V could also work as an alternate leader for both Spain and Germany. King Alfonso X of Castile is also an interesting option for a medieval Spanish leader in a future game.