This is a late addition to this thread and may be my point has been recognized already. While you can't go out and inspect the new A concourse without an outbound ticket etc., you certainly can take a detour when deboarding at any concourse either walking the concourses, or using the North-South shuttle train. I had some time to spare a month or so ago and made the whole trip--it does seem a very long distance to the last gate (somewhere in the vicinity of Tacoma , but the overall impression is one of light and air and it is a very attractive addition. Now they have to improve B and C, and maybe D.

Flyer 420
in Boulder