https://arstechnica.com/gadgets/2018/04/mysterious-amazon-com-page-hints-at-forthcoming-fire-tv-cube/

Signs point to the rumored Amazon Fire TV Cube being a real device that may debut soon. AFTVNews first spotted a new page on Amazon.com that promotes the device with the slogan, "What is Fire TV Cube?" The page provides no other details about the device, but it allows those interested to sign up to receive more information as it becomes available.