Granted I don't work at Splunk anymore, but did recently. They were definitely working hard on migrating everything to python3, and if I remember, they had a planned roll out where python2/python3 would co-exist.
I honestly had no idea the SDK has supported Python 3 for this long. Granted, I haven't worked with it since 2015, but still surprised I missed that. Glad to hear they are making such good progress.
However, if you've been using the python SDK for Splunk - its been supporting python3 for a few years already (https://github.com/splunk/splunk-sdk-python/commit/4503db961...)
See this blog post: https://www.splunk.com/blog/2019/07/01/admins-and-developers...
And this helpful doc: https://docs.splunk.com/Documentation/Splunk/7.3.1/Python3Mi...