This week we have enjoyed with the Dynamics Virtual Camp organised by the Spanish D365UG Community. On Monday, my colleagues @VanesaGC_Flow, @dbalaguer and myself (@RamonTebar) delivered a session to explain and demo the new features coming this year in Microsoft Flow.
As part of the presentation, we prepared the following map to summarise the new features and their categories over a chronological line, which helped us to explain what and when things are coming:

We also demo some of these new features. One of them was the ability to have custom controls embedded on Business Process Flows.

The following article explains step by step how to add your custom controls to the Business Process Flows:
https://powerusers.microsoft.com/t5/Microsoft-Flow-Community-Blog/Preview-Custom-Controls-in-Business-Process-Flows/ba-p/263237
Finally, if you want to download the slides of our presentation, you can find it in this link:
https://www.slideshare.net/RamonTebar/d365ug-virtual-camp-may-19-new-microsoft-flow-features