Introducing the new Cumulocity Notifications 2.0 API

Do you plan to enable subscriptions in mo context for multiple sources (and add and remove sources in a subscription on a fly)? At the moment, if I need to subscribe a microservice to receive measurements from all devices in a tenant, I need to create as many subscriptions as there are devices and what is even worse, open as many websockets between microservice and cumulocity as there are devices. Or do I understand something wrong?
Thanks.