For everyone following this thread:
The new feature is now in open beta and is called "Network Objects":
https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/Network_Objects_Configuration_Guide
Havn't implemented these in production yet but so far I'm pretty happy with how this feature has been implemented.
- Network Objects are work accross an Organization so they can be used at multiple sites
- The UI is pretty intuitive but doesn't allow for cut and paste (probably a design decision)
- The auto search /search for objects is great !!