I just heard about the launch of Power Pages. Is this offering an internet (external) or an intranet (internal) only? What are the limitations? What is Power Pages (preview)? | Microsoft Docs
Power Pages is for external websites that may (or may not) be connected to a datasource at a company like customer records, services, known issues libraries etc. The product is still in preview with customers but I think the best place to get more info is in their community which you can find here: https://powerusers.microsoft.com/t5/Microsoft-Power-Pages-Community/ct-p/MPPCommunity