I think that the thing to remember here, is that there will be a quality repaint kit, so many liveries will have to be requested from the well know repainters. Or you will need to do them yourself.

Although I would love to see a 737-100 and 737-200 in the Qantas scheme (fictional, of course), I'm beginning to think it is time for me to learn how to do repaints so I can do it/them myself.

As for those requesting that Captain Sim do this livery, or that livery, so it will be available in the release, I doubt you will get them. From the original post by Alex, the three 737-100 and the five 737-200 liveries listed, are the one we will see when it released. I think this particular line says it all:

Of course the '737 Captain' will come with high quality repaint kit. So we hope all liveries requests will be fulfilled one day.

Mark