Salesforce is migrating from JDK to ICU Locales.  You can see more details in their online help: JDK Locale Format Retirement

Our checks have not located any issues with this announcement.

Should we subsequently discover anything, then we will post updates in this FAQ.
The latest and most up-to-date information is in the FAQ - Contacting us directly or via support will not have any additional information that we can provide.