The most important change is related to developers. Joomla's framework is separated from the CMS, meaning that it's possible to build new applications with the Joomla framework.
With the new new the Joomla platform v11.2, which is included at the latest Joomla download package, Joomla.org wants to change the way developers, architects and service providers deal with Joomla in the future.
Developers will be able to use the Joomla platform independently of the CMS. This means that youll have the choice between different CMSs on top of the Joomla platform in the future.
The platform also allows developers to contribute / add features more quickly. In the past, good code wasnt always included into Joomla core. With the Joomla platform stored on GitHub it is very easy to fork it for your own purpose and it is easy too to integrate your code in the main branch.
The platform will also follow a 3-month release cycle, making it possible to add features into the platform much quicker than into the CMS.
The platform package consists of the files stored in the folder /libraries and /media. The platform has no user interface. The platform source code is stored in the Git version control system GitHub.