Construction is progressing on the new transit station and surrounding facilities for Universal Beijing. This complex will be the gateway for many guests entering Universal Beijing Resort. The station will lead to CityWalk which guests can walk through to get to the theme parks, waterpark and hotels. Pictured is the red area on the map in the second image. The adjacent yellow area is CityWalk. Note the pedestrian bridge connecting CityWalk to the two parking garages across the street, which is exactly like Universal Orlando.
In regards to the theme park specifically, additional construction tenders have been submitted recently for "amusement rides" and the theme park's "technical service buildings." The planned duration of these tenders on average is about 815 days meaning that construction is expected to take place now through Summer 2020, with a potential opening in late Fall 2020.
Sources: https://mp.weixin.qq.com/s/fmsvBGSuDxTKqblhsQky9Q and http://www.bcactc.com/home/gcxx/sgzbgg_new_show.aspx?ggid=F0SG201800179&publicsource=1 and http://www.bcactc.com/home/gcxx/sgzbgg_new_show.aspx?ggid=F0SG201800178&publicsource=1