The drop in feature is not new however it is to others outside of the US, unless they had there devices setup as being in the US.
This feature although sounds cool it still isn't ready for prime time.
There have been reports of this being falsely activated or activated without even a command being heard.
I've seen many issues with AWS over the last few months which leads me to thing they need to add more servers to handle the expanding traffic.
Even device discovery fails more times then it succeeds for me lately.
At least even though the discovery shows previously configured devices as off line I can still control them with Alexa.