Retina iPad mini shortage speculation, PR stunt?

So, we had even the big boss, Tim Cook, saying that retina mini supply would be constrained. Yet even today, the estimated shipment time for all models have not changed. Compare that to the iPhone where shipment dates creeped up fairly quickly (still 1-2 weeks, compared 5-10 days for the retina mini). Was it all just a PR stunt then?