Whoa yeah, this thread is a blast from the past!
RE: HIA (MDT) yep they are planning a lot, I know people in Middletown along the river whose houses were bought out a few years ago due to expansion and/or upcoming "noise pollution" from new and lower flight patterns so I assume we will be seeing a lot of changes in the coming years.
Due to some unfortunate circumstances I had to spend a lot of time in Harrisburg again April through May and the area is definitely changing. It's still a weird animal to me but it doesn't seem to be as "stuck" as it was prior to now and there seems to be some good momentum going.