This is just my two cents on the subject:
It seems to me that rumour mills are always present with any platform. Apple is an excellent example -- someone gets wind of what they "may be" up to and they speculate and show pictures on sites like macrumours and then the product gets released and it is really not at all it was made out to be. The example I can think of most recently was back when they changed from the Graphite G4 to the Quicksilver G4 model, there were all kinds of crazy renderings of what the new case would look like and the specs that were reported to be in the production model. It was a lot different (although IMO the Quicksilver was a good machine) than it had been made out to be. The rumour site does *seem* to drive interest though.
Sorry about the lengthy post -- but my point is simply that Amiga is not immune to rumours of what will come. I too would love to see some new hardware released with OS 4 and also be priced competively enough that it could gain users and be a viable alternative to a PC.
Rumours will be a part of any platform and it is one of the pre-marketing techniques of some companies to leak some info rmation to get their product into the public's eyes so when it does get released, we all say "Wow, here is this thing we've been hearing so much about, lets buy it." -- At least this is what the marketing folks would like us to do :-)
Of course, some rumours are nothing but "vaporware" and so I am in the camp that believes in waiting until it is actually released before getting too excited about it.