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The Magnolia UI project version 6.1 x contains both the UI framework used in Magnolia 5.7 (referred to as Magnolia 5 UI) and the Magnolia 6 UI framework. You can use either framework.
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In the Magnolia 6 UI framework, the core components of the UI are located in the magnolia-ui-framework
module inherited from Magnolia 5.7. The new magnolia-ui-framework-jcr
module is also part of Magnolia 6 UI.The Magnolia 6 UI framework has been released as a developer preview since its API may still change. Nevertheless, feel free to try it out.
UI modules
For more information on the Magnolia 6 UI modules, refer to UI module.