Key Vault Notification feature is currently in Public Preview and available in all public regions.
Notification overview :
Respond to Key Vault events with Logic Apps guide is published https://docs.microsoft.com/en-us/azure/key-vault/event-grid-logicapps
Work on extending RBAC integration with Key Vault to be able to create certificate/secrets/keys permission. Also ability to manage keys, secrets, certificates permissions across key vaults : management group, subscription, resource group level.