They should just rename the expo as the Zhuhai Defense Expo because clearly there are other weapon systems that are taking just as much prominence as the air assets.
The 122mm variant was shown previously but this is a new design, mating a retired PL-66 152mm with the Mengshi chassis. As the PLA retires old gen systems like 152mm and Type 59s, expect to see additional novel attempts like this to repurpose those old systems.
The RAM referred to in the description is no RAM coating but the acronym for rocket, artillery, and mortar. I think this is China's first publicly revealed mobile laser system capable of tracking and destroying enemy munition. I think it'll have good military applications.