My father bought the last DCS system from our locale hobbie shop in November 2013 and I asked when they would have more. There answer was in the spring. I do not like these vage answer when you are willing to spend what I consider a lot of money for some thing that seem to get poor customer service and none accurate delivery times.
You have to remember that it's not the hobby shop that is the issue here, they're at the mercy of MTH, and they're at the mercy of the overseas manufacturing plant. Until they're completed and shipped to MTH, you ain't gonna' see them at any hobby shop!
The vague answer is because they really have no idea when they'll get them, how could they?