To this date Niantic has not indicated any plans for releasing a beta for Wizards Unite. Following the example from other Niantic games like Pokemon GO and Ingress, it is unlikely that there will be a beta for Wizards Unite. Wizards Unite currently has a planned release date for some time in 2018, although it is likely that we will be hearing a more specific date fairly soon. Players that would like up to date, real time news, from Niantic regarding any updates should proceed to the official wizards unite website and sign up for the newsletter to be notified via email whenever any news is released. We can all dream of a beta with an early release date but it is likely we will need to suffer until the game is officially released!