In 2.81 python api the bpy.types.Cycles*
classes are omitted from docs but mostly still accessible ?
Can they be found elsewhere in the docs ?
Till there is no changes you can use API reference form 2.80, for example CyclesRenderSettings
Source of Cycles types contains in Blender_installation_path\2.8*\scripts\addons\cycles\properties.py, you can use it as reference simultaneously.
bpy.types.CyclesRenderSettings
: developer.blender.org/T68050 $\endgroup$