Will this be linked together with my echo? One thing I do quite often since my echo is in my kitchen is use it to set a timer. I'd like to be able to go to my office upstairs, and ask it how much time is left. Today, i don't think that's possible even with a second echo.
I have two echoes now. Timers are separate, backend content is synced. You could use the Amazon dev kit to make a universal timer. (That is a good use case)
The Alexa iOS app has a good drop down to manage each device separately.
When I first saw the dot I was very excited thinking it was exactly this, but it appears it is just an echo with a lower quality speaker and a simple cable (and bluetooth) you can connect to your own speakers. A bit of a bummer synced timers and playing the same music through a couple of Echos in different rooms would have been a better use case for me, but perhaps I'm the weird one.