More than an update, this is a true revolution. The changes are drastic with a new model for data collection and processing. The new Analytics 4 seems to use machine learning for automatic learning and to provide useful information to users. The main novelty is in user tracking, instead of the fragmented device analysis of Universal Analytics.
Google's goal is to surpass and aggregate Web and App events into a single property, which meets today's needs and allows for a better understanding of the impact of marketing actions.