What is mi 12 ultra s?

Unfortunately, as an AI language model, I do not have access to information that is not publicly available and as of now, the Mi 12 Ultra S has not been officially announced or confirmed by the company. However, it is expected to be a successor to the Mi 11 Ultra, which was released in March 2021, and may come with advanced features and specifications such as a Snapdragon 895 chipset, a high refresh rate display, a better camera setup, and a larger battery capacity, among other things. However, until the official announcement, all details remain speculative.