Qt 5.15 Beta1 release means that it has entered the Beta stage, based on Qt development team to provide the release plan , they will periodically release beta version of the Beta version of the update until the advent RC version (expected to be released end of April), and then in May released stable version.
5.15 Qt Some updates include:
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As Qt 3D brings improved analytical support
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OpenGL renderer will be available as a separate plug-in
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Core aspects of the various changes
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Improved QColorSpace
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Various improvements for QML
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By Qt Quick Controls 2 improved support for tables
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Upgrade Qt WebEngine
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QDoc generate a DocBook support
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The new Qt PDF module
Developers can use Qt-line installer to install or use the downloaded installer in Qt-line maintenance tools to get Qt 5.15 Beta1. Qt Account portal in commercial packages the user can use the source code, the user can open the download.qt.io source code package.
New features introduced Qt 5.15 See the https://wiki.qt.io/New_Features_in_Qt_5.15