The reason for the re-design is that Terminal D (if it is ever built) will be the international arrivals terminal, necessitating a change in the planned design which dates (I think) from the mid-1980s security climate. That won't work today.
I don't believe that MCI
is going to build a new terminal. They still have to build a peoplemover system that we voted on back in 2000 (projected starting date for construction on that is 2010 or something like that).
In any event, if they build a Terminal D, I'll be quite surprised. Even with the expected increase in passenger traffic, the TIPs project has increased gate capacity by nearly 50%, from a maximum of 60 to a maximum of 90 gates. There's no need to build a Terminal D at this time.
Those who fail to learn history are doomed to repeat it in summer school.