(At least some) publishers have been emailed, yes.
The core message is as follows:
"In the future we plan to compare the value of the element published in your organisation file with the calculated total spend (expenditure + disbursements) for a given year published in your activity files.
To prepare for this please ensure you are publishing an organisation file which contains the element for at least all years that you have been publishing to IATI."
I’m not sure I understand this last part: “for at least all the years that you have been publishing to IATI”. This seems like a fairly tall order, and not necessarily a very useful one for publishers who have (very partial) data going back over many years.
I assume coverage will be assessed for recent years (probably a year behind, as suggested by Steven). Could the Tech Team confirm what is the proposed approach?