"Units from the first production run of FM3 have no headphones jack or circuitry. These units are functionally identical in every other way to later production units with a headphones jack (expected April, 2020). To reduce the wait for the many customers who don't care about this feature, we decided to offer these units at a reduced price rather than partially scrapping them ($949 vs 999). There would be no way to upgrade.
The positive take on this is that those who don't want this feature can get a unit sooner; those who do want this feature will have fewer people in line in front of them."
Better start selling now as it is before more people abandon ship...