This is a somewhat major release.
The version of the PYTHON.json format has been changed to 5 and with that change comes a ton of new annotations. See https://python-build-standalone.readthedocs.io/en/latest/distributions.html#python-json-file for more.
This release also has initial support for Python 3.8! However, static Windows builds are not yet supported.
The version of LLVM used to build distributions has been upgraded from 9.0.1 to 10.0.0.
Also, the naming convention of the distribution archives has changed significantly. The names now convey the target host triple and the optimization level.