Magento 2.4.0 will be delivered in 2020 with various new features and updates. Adobe team announced it yesterday.
One of the most significant improvements that have been made to the upcoming release is a more highly-performant GraphQL storefront. It will allow making fast, scalable, and adaptive eCommerce solutions.
Now the 2.4-develop branch is opened so that community members can have a look at it as well as make some contributions to it.
The whole set of features is kept a secret yet. But we will tell you about them as soon as they come to light.