Dataflows are now available in Power BI GCC. As I speak with you, dataflows have been the most requested feature. Dataflows are extremely powerful and open a whole new world of possibilities with business intelligence. You can read more about dataflows here: https://docs.microsoft.com/en-us/power-bi/transform-model/service-dataflows-overview.
Rest assured, I will be talking more about dataflows in our community calls and on this blog. I would love to hear about how you are using dataflows.