In the following article you can find a good description about the new Data Flex Pro. In a nutshell CDS (Common Data Service) will be renamed to Data Flex Pro and MS Teams will get further enhanced to show Apps and Data from CDS. In short words: MS Teams will be enhanced to access/show/modify CRM/ERP data from the CDS. In other words, MS Teams will grow into being a new way how to access MS CRM data. A new way of collaboration.
And a follow up article with a more detailed description and the differences between Data Flex and Data Flex PRO.