This morning version 7.2.1 became available to me. I conclude from this that the roll-out of new versions are per region, but the (bulletin) messages you see in your instance are sent immediately all over the world after a release in US
I think so but the Splunk webportal should show the latest version, but it did not, just showing 7.20. Cleared all browser caches I could find . So you were able to download the new version!? - I will check myself .
yes, 7.2.1 is officially out yesterday(11/09),clicking on the message will direct you to Free Trails and Downloads page---->splunk enterprise(download free 60 day trial)------>download when you login
If not you can download it from here(you can click on older releases if you need a different version)