Just had my 1D-X in the shop for adjustment about a month ago, at which time they adjusted the auto-focus assembly. I also happen to have one of the "affected" cameras, even though I am no presently experiencing the symptoms of poor auto-focus performance. I'm a CPS Gold Member, so I just called the CPS Service Center that serviced the camera to find out if they happened to have dealt with the lubrication issue while it was in the shop even though my paperwork didn't say anything about it. Unfortunately, that was far enough back that they did not yet know about the advisory, so the work was not done then.
They were very helpful and offered to send me a FedEx waybill or code to send my camera back to them free of charge to get serviced. I am presently using the camera too frequently to part with it for a week, so I asked if the opportunity to have it serviced at Canon's expense would expire at some point, and I was told that it does not expire. So, for those who are interested, you can wait until it's convenient to send it in (or until you experience the problem) and then call CPS to have it serviced at Canon's expense.