I had not known much about China's 2 nominations this year. But all is revealed once the WHC session starts.
Shennongjia Nature Reserve (or Hubei Shennongjia) is quite an old nomination. Rejected in 1980, and the current nomination was added in 1996 to China's Tentative list. When a country has 55 tentative nominations, and its still putting forth nominations from 20+ years ago, I think it speaks for itself.
Zuojiang Huashan Rock Art Cultural Landscape is very close to Nanning, which I just realized put me within an hour or two drive from all 3 serial sites of this nomination! Another close call, since I was in the Nanning and Guilin area for about 10 days in 2006, almost exactly 10 years ago! Since this rock art nomination only came into existence in 2008, perhaps my ignorance is to be expected. The challenges of a WH traveller! In hindsight I should have been more ambitious while I was in Guangxi province, but I was tired from 2 weeks of traveling that covered Beijing, Qufu, and Xi'an!