As far as I know there is nothing like Logic Apps in SharePoint, additionally there is no official release notes on SharePoint Logic Apps.
We have Flow Apps in SharePoint which is same as Logic Apps in Azure. I used Flow app in SharePoint Online to create Workflow like functionality which synchronized with Mail Chimp.
For more details on Flow apps you can go through Flow in SharePoint and SharePoint and Flow
Moreover you can also use Logic Apps to connect to SharePoint. If you need information about how to connect Logic Apps with SharePoint you can find this post interesting
Let me know if you need more assist.