There are no mentions of Amazon Fire TV boxes.
The other take-away from these two links is that Amazon only garnered 1% of the market with their products, even with their cut-rate pricing. . . and that their hardware division is struggling. Ergo, I DO know what I am talking about.
If Amazon comes out with another Amazon Fire TV, it probably also be a device made by reference design house in China, not designed by Amazon's dwindling number of engineers.
I am surprised they did not already have a replacement ready to go when they ran out of stock of the older model. That's what retailers of Amazon's expertise do. . . they know about product lead-time and approvals from the FCC take from three to four months before you can go to market.
These days, it is extremely rare for their FCC to deny a permit on a device that emits radio frequencies under 300 feet (WIFI, Bluetooth) for any reason because the reference designs are pretty much cookie cutter. Most manufacturers just go ahead and build inventory pending approval (you often even see that on the label on new devices) so they can put it on shelves as soon as the permit ink is dry, especially for a new version of an existing product.
So, my question is still valid, Mad Dawgg, where is it?