https://arstechnica.com/gadgets/2018/09/amazon-echo-subwoofer-and-alexa-capable-smart-plug-may-be-on-the-way/

Amazon seems to have given us a glimpse into some of its new, unreleased products. Listings on Amazon UK show a new Echo Sub, a subwoofer designed to work with Echo speakers, and a new Amazon Smart Plug, a socket adapter with Alexa capabilities, both with an availability date of October 11. Amazon has since removed the listings, but reports from Pocket-lint show images and details of the two new devices.