We’re getting closer to being able to release the new 1.13 map. There’s still some crucial things that haven’t received an update yet, so currently there is no planned date for release other than “soon™”. A new map means that the current map will go into read-only and your inventory will not be transferred over.
Full details on the update will come later when we have an official date.

Confirmed changes for 1.13 so far:

• A new map
• Increased region sizes