Arnold for Maya is included with a default install of Maya 2017 via the mtoa.mll plug-in. This plug-in is auto-loaded, and Arnold is set as the preferred renderer in Maya. More information about Arnold for Maya can be found in the Autodesk Maya User Guide. More information about changes to rendering in Autodesk Maya 2017 can be found here.
A guide to transitioning to Arnold for Maya 2017 can be found here.
(Note: skydome and mesh lights wip).
Color management is supported by the Ai Skydome light and Ai Sky shader.
Light blockers are supported in the viewport.