https://www.cnet.com/news/amazon-just-accidentally-revealed-an-echo-subwoofer-and-smart-plug/

Pocket-lint, a UK tech site, discovered listings for the Amazon Echo Sub, a 6-inch, 100-watt subwoofer designed to pair with up to two Amazon Echo speakers to help fill a room with sound, and a new Amazon Smart Plug that could let you control an electrical outlet with Alexa voice commands as well.

It's particularly intriguing that Amazon might soon allow you to pair two Echos together to create a stereo sound system with distinct left and right channels. Last we checked, that wasn't possible. You can do multiroom playback where each of your speakers is playing the same music in sync, but they'll be playing it in mono. (The Alexa-equipped Sonos One does support stereo pairing, though.)