Surely you've been around long enough to realize that it always works that way. All it takes is one source to start an Apple rumor and within days it has appeared on hundreds of sites. Then, the fact that ti's on hundreds of sites is used as 'confirmation' that it must be true. Then, when it turns out to not be true, someone releases a story that Apple failed to do it because of supply chain problems or because of the development team being behind schedule - and the stock drops.
Or the other variation on the theme. It all starts with some analyst and because it was an analyst it is taken as fact and posted around. And then when it gets closer to the magic time, the analyst gets nervous about being wrong and starts posing questions of possible issues that might delay things etc.
This version is very common when you are talking about the what of a product. So like Mikey the Analyst might start a rumor that he has been told by sources that yes Apple is definitely making a real TV and it's due out this holiday. It is going to come in 4 sizes ranging from 36-60 inches, will support 3D, 4k, be a smart tv AND have a built in 3d blu-ray player. Oh it will also be paper thin, solar powered etc.
And then a couple of months later Mikey will get reports that there are production issues and suddenly the magic Apple TV isn't coming out for another year, no wait two years. When perhaps it was never coming out.
In fact I'm still waiting for the rumors that the DOJ ruling on ebooks and the inclusion of other media has killed Apple's plans for a subscription tv services, iTunes Video Match and new better video quality that mirrors physical blu-ray offers at half the price of the discs. AND the rumors that the 'real' tv is being delayed due to these offers being made 'illegal'.