"NDK r21 LTS" support in Unity 2019?

Unity Engine
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1

Hi! I would like to know when will Unity start to use the first LTS release of Android’s NDK: r21 (currently in beta but will be released end of 2019).

I know that NDK r16b is the version that is being used currently in Unity version 2018.4 to 2019.2. And that NDK r19 will be the next supported version in Unity 2019.3 based on this document: Unity - Manual: Android environment setup. Is the decision to support NDK r19 next already final? Is it possible to have r21 supported in Unity 2019.3 instead?

2

No, I don’t think so.
2019.3 is in beta already, and updating the NDK is not a very safe and easy thing to do.