Today, Microsoft has been published preview of new development tools for NAV as promised (before the Christmas). New tools are intended for extensions and apps development.

We have two tools:

• The In-client Designer to make extensions in the client by consultants.
• Visual Studio Code for building powerful extension and apps development, based on tables, pages and codeunits, using the new objects Page Extensions and Table Extensions.

You can start if you have your own Microsoft Azure subscription, using the following link http://aka.ms/navdeveloperpreview

More about it on Microsoft blog.