The 69th annual Writers Guild of America Awards was held in Los Angeles and New York City at the same time on Sunday night. 
Big surprise for Moonlight winning Best Original Screenplay. Most were predicting Manchester by the Sea or La La Land. Moonlight is in the Adapted Screenplay category at the Oscars due to it being based on an play that was never produced. It has tougher competition against Arrival, Hidden Figures, Fences and Lion. 

Kenneth Lonergan for Manchester by the Sea is still the Oscar frontrunner for Best Original Screenplay against La La Land (musicals don’t generally win for their script), Hell or High Water, The Lobster and 20th Century Women. 

Full list of WGA winners: 
Original Screenplay Moonlight
Adapted Screenplay Arrival
Documentary Screenplay – Command and Control