The hardware hasn't changed since last year's announcement and still is built around an 802.11ac (aka Wi-Fi 5) 2x2 three radio tri-band design. It also has Amazon Alexa built in and can be used as a Bluetooth-paired speaker.
The main change is that instead of just working only with ASUS Lyra mesh routers, it now will mesh with any ASUS router supporting its AiMesh system.
Visit the Lyra Voice product page for more info.