Is there going to be plans for a module repository? Some way to update(and or install) modules with the click of a mouse? Also, what about the ability to upgrade ISPConfig from within the browser itself? FreePBX has a good example of how to have modules installed through php and the browser. It also manages the updates of the installed modules, and lets you search for new modules to install.
ISPConfig has already a update function and module and repository support. You find these features under management > software.