We ordered a USB connector on our first production run of boards because our original test fixtures needed to use it as an interface. The second run of boards was ordered without it, since our original test fixtures have long ago been upgraded and no longer need the connector. We’re getting close to that second round of boards making it into production.
While USB isn’t a supported interface (the connector is buried under a plastic shell and there’s no way to get a cable in without the lid open), some folks here have been experimenting with it. This won’t affect you in any way that I can think of, but it might cause some confusion when newer machines don’t have it, so I wanted to give a friendly heads up.