Something that people have been asking for a while on multiple threads now, has been confirmed by Blizzard.
We will receive the Realm Details before character creation
While we haven’t yet finalized the numbers of realms and realm types for each language, we’ll let you know those details before name reservations start on August 13.
https://eu.forums.blizzard.com/en/wow/t/french-and-german-realms-for-wow-classic/60051