An example of a new feature would be that the script will ask you which version of CraftBukkit you want downloaded. The version would go by http://dl.bukkit.org/downloads/craftbukkit/
If you want the current recommended build, you can just leave it blank.
If you want the current beta build, you can type in beta and press enter.
If you want the current development build, you can type in dev and press enter.
I'll probably also be writing a new script that'll update your craftbukkit.jar file if a new recommended build comes out. It'll probably just be a wget to link.