PowerApps/Flow buttons out of preview. The buttons for creating and launching PowerApps and Flow directly from libraries and lists are out of preview, and available in all commercial tenants.
PowerApps now supports multivalued and taxonomy fields.
PowerApps support for read / write attachments has been released.
Flow launch panel is generally available.
Flow for OneDrive. Building and launching custom Flows is now available from the OneDrive web interface, as it is for SharePoint libraries.
Set content approval status action is now available in Flow. Using this action, you can build a custom approval process and invoke this action directly on lists or libraries requiring publishing approval.