The current limits are documented at Prepare your data—ArcGIS Maps for Power BI | ArcGIS . According to Esri Introduces Global Demographics and More to Microsoft Power BI, the Plus subscription will have the "ability to plot up to one million points on a map each month".
Is it possible to get some more details around the new limit? How would this time-based limit interact with the current per-map limits of 1,500/10,000 features? Would the new limit override them?