Finally real time ray tracing is starting to trickle into the world of architectural visualization. This is thanks to huge advances from NVidia and also Unreal Engine. Real time ray tracing will be the next big thing in arch viz, because it will enable artists to have massive amount of creative freedom, with an ability to achieve photo realism even with instantaneous results. If we can achieve photo realism in real time, offline render engines will start to dwindle in popularity. Architects want quick iterations, and artists want intuitive tools.
Check out this video below to see what the industry leaders are currently doing with this awesome technology: