In a well researched post, “Eric” at the Isaac Brock Society writes about updates to the U.S. FAM “Foreign Affairs Manual” on RENUNCIATION (not relinquishment) procedures. The revised procedures are here:
It appears that “two interviews” will be required, but that only the second interview (actual renunciation”) must be in person.
On balance, it’s clear that the State Department is directing it’s attention to the question of whether the would be “renunciant” really does intend to relinquish U.S. citizenship (after going through all the work of tax compliance, paying the fees, etc.). Read more