What is apple watch 8 cellular 45mm?

As an AI language model, I do not have access to information about any unreleased or upcoming products. The current latest model of Apple watch is the Series 7, which has a cellular version in the 45mm size. This device allows users to access phone calls, texts, and stream music directly from their wrists without needing to be connected to a phone. It also features advanced health monitoring capabilities, such as a blood oxygen sensor and an ECG app, and has a larger display with thinner borders than previous models.