Yes, I got this message from the US State Dept on Oct 21, advising US citizens to defer all non-essential travel to Ethiopia.

Earlier this year I had booked travel on ET, transiting Addis Ababa both outbound and inbound. My inbound involved a 17 hour layover, and I had made plans for a day tour of the city. As it turned out, ET cancelled my flight about a week ago. Don't know if the cancellation was related to the state of emergency or not, but I had to rebook nevertheless. I am now flying other carriers and avoiding Addis Ababa entirely on the inbound. My outbound flight is still on ET, and I have a 4 hour layover at Bole. With just 4 hours, I clearly don't plan to leave the airport.