Was rather surprised there wasn't a topic for Watch Dogs!
Anywho, just read this good interview over at GamingBolt.com.
I certainly recommend reading it for anyone interested in the game, but of particular interest for us PC Gamers:
Ravi Sinha: What graphical options can players expect from the PC version?
Francis Boivin (Team Lead Programmer): Disrupt was developed to have state of the art visuals on all its quality levels. We needed to have AO, massive dynamic light support, HDR, GI, depth of field, etc. to fully realize the ambition of art direction. We improved on techniques that we worked on in the past and surveyed what was available for the highest level of quality we wanted to achieve. We didn’t just integrate the technique of the moment, but spent quite some time turning stuff around and mixing algorithms so they fit our requirements.
*Note: Disrupt is the name of the new engine developed for Watch Dogs.
Release Date: November 19, 2013 (NA) (Current-gen)