We should have ability to have a single view of all emailings/ landing pages/ assets regardeless of where there are hosted (Design Studio, Marketing activities...).
You should be able to see all local assets from Marketing Activities in Design Studio today. In Design Studio, you'll find the local assets with their program name in front. For example, if you have a landing page called "Registration" insdie the program "Webinar Program" you'll find it as "Webinar Program.Registration" in Design Studio.