Pretty exciting news! I'd LOVE to be a developer who gets to work on that project. It get's me all tingly and excited to think about what kind of problems they get to solve on a daily basis.
I think that the FAA will demand that Amazon runs the test program without hiccups for a while before considering a more realistic test, such as one with the drone outside of the pilot's line of sight, or a flight with bad weather conditions. All in all, it will likely be at least three years before this is rolled out to any actual customers.