Jiangnan got a contract to build an LNG carrier late last year. It wont be that big as Hudong Zhonghua has been boasting lately about building the world's largest LNG carrier starting 2020.The large dark cylinders are pressurised tanks for liquefied natural gas. They are to be installed on LPG carriers.
The mega sized container ship people are seeing in that pic should be a member of COSCO Shipping's new Universe class. This ship is a technological marvel in its own right.