Premium per user and incremental refresh

GRob 

are taking about migrating users one by one or incremental ETL. As far as I know, the premium user will able to share with other premium users

more details refer :https://powerbi.microsoft.com/en-us/blog/announcing-power-bi-premium-per-user-general-availability-and-autoscale-preview-for-gen2/

incremental ETL is even available for Pro user

https://docs.microsoft.com/en-us/power-bi/admin/service-premium-incremental-refresh