It’s a new remote, but it’s not linking to your echo device. It’s using the Alexa cloud service.
So basically, it’s a voice remote specifically for the fire TV. Like similar voice remote from Comcast and other services we must hold down the microphone button while speaking. It’s not hands-free the way the echo is.
Also, at least from introductory materials, you will not be able to control your “connected home” devices from the fire TV remote. So you won’t be able to turn lights on and off even if you can control those lights from the echo.
The following is also significant:
Please note it does not work directly inside individual applications, like Netflix.
If instead, I combine smart things plus harmony plus Roku plus echo, I can in fact get granular control inside of Netflix for any buttons that the Harmony remote would use. So I can get voice control of pause, rewind, etc. inside Netflix with echo, but not with the fire TV remote.
The new feature will be nice for many people, but it’s not full voice control yet.