From what I've picked up - there seems to have been some communication with the owners - original notification of problem, and then subsequent update on the problem, fix and possible time frame.
I would imagine that the majority of communications are going through the dealer network, rather than direct from MMC, as they would have the full contact details of those they sold the vehicles to. I would also imagine that there are good dealers who are prioritising the dissemination of information, and then there are others.
