ray tracing is coming to Diablo 4 this month, and it's just been announced that's happening on March 26th. So, should you require any further incentive to dip back into the game, it ought to look a little prettier once that patch has launched. So long as your GPU has the ray tracing chops to cope with the extra load, that is.
While regarding the spookier effects of shadows..."the many shadows of Diablo IV will be enhanced with ray tracing, adding extra detail to all scenes." Nvidia showed off the twin lighting effects at the CES event, and you can see what a difference they make below:For me, I think it's probably the shadow effects that are going to be the most noticeable, and have the biggest visual impact on your game. Devs have become very good at faking reflections to the point that you sometimes really have to look to see where ray traced reflections make a difference.