We have a number of breaking changes to do. Prepare all of them, then make an announcement to the community before going live. Follow the Stable Interface Policy.
T327062 - Show entity labels in parsed edit summaries in API requests as well
T300460 - WikibaseClient wblistentityusage API module adds to pages output when not used as generator, potentially throws RuntimeException
T300458 - list=wbsubscribers API uses output inconsistently
T196962 - Module prefix 'wbeu' is shared between Wikibase\Client\Api\ApiListEntityUsage