You can read more about the release and its rationale in the PM article published in the community:
https://community.embarcadero.com/article/16556-rad-studio-10-2-1-released-today

For the actual release information docWiki page, including how to obtain the release, what's new, known issues, visit:
http://docwiki.embarcadero.com/RADStudio/Tokyo/en/10.2_Tokyo_-_Release_1

For a more detailed of issues fixed in this release, see the EDN article at:
http://edn.embarcadero.com/article/44763

We had to put a significant effort into some of the issues, like those caused by Creators Update and changes in iOS, so very happy to make this new version of Delphi and C++ Builder available to our customers.