Shilao talked about this in one of his recent podcast when he was talking about 075 LHD Guangxi (32). The rumour is carrier names go from North to South while LHD names go from South to North.The first source said the new carrier would likely be named the Jiangsu, following the protocol of naming the vessels after coastal provinces, starting from the north to south.
He suggested to someone high up that one of the 075 should be named Shanghai as it would follow the tradition of 002, where the ship's name matches the province of the city that built it and was told no way in hell and Shanghai should get a carrier. Regardless this rumour about the North-South thing was never confirmed and remain a rumour.