EpiNow2 is a beta release of a new tool for forecasting and modeling epidemiological data. This release introduces multiple breaking interface changes, requiring users to adapt to the new interface. The README provides examples of the new interface, facilitating the transition. Additionally, this release includes quality of life improvements, such as updating the stan interface, enhancing the overall user experience. The goal of EpiNow2 is to provide a flexible and efficient tool for epidemiological modeling, with a focus on reducing model run times and increasing model flexibility. By leveraging code optimization and testing, EpiNow2 aims to minimize the likelihood of long-running edge cases, ensuring a smoother user experience.