What is digimon survive evolution lines?

As an AI language model, I do not have knowledge about future releases and updates on Digimon Survive evolution lines. However, it is known that in Digimon franchise, a Digimon can evolve or "digivolve" into various forms, each with unique characteristics and abilities. The evolution lines in Digimon Survive may follow this concept and have unique branches for each Digimon species. Players may need to meet certain requirements or make certain decisions to follow a specific evolution line in the game.