Most probably instead of a new property, the old person authority one will be re-defined. If that happens, it will require:
Instead of creating a new property, National Historical Museums of Sweden ID (P9495) was redefined to allow for prefixes.
The existing people items have been edited, replacing the old ID with the new one (with person/) prefix.
An example with object/ has been added as "property example" to National Historical Museums of Sweden ID property.
The museum staff are working on adding the ID to the items of objects, example. They've been at it for a couple days. At the next meeting, we can ask about the progress and whether they need any additional help with this task.