With this feature (probably in v2.3.0), roles will be enabled a different way.
A. There is a base package of simple roles that are enabled, meant for beginners. These will be added to Crewmates, Impostors, Neutrals and Add-Ons
B. Role Factions
You can click a button to load in a role faction. These factions will be reorganized into names such as Crewmate Investigation, Impostor Hindering or Neutral Evil (much of these exist, but they mean more now)
C. Extentions
Similar to Add-Ons in PL, you can add extensions via another DLL file. These extensions will contain their own loadable faction of roles, either Impostor, Neutral, Add-On, or Crewmate.