[Building Sakai] GradebookService and Assignments 2

[Alexander Bell]

I've been using this method to get a list of assignments for a site but 
it only seems to be returning assignments created with the assignments 
tool and not assignments 2. Is this intentional or am I just missing an 
additional service/method to get assignments2 assignments?

...
    Assignment assignment =null;
    List gradebookAssignments = gradebookService.getAssignments(siteId);
    for (Iterator i=gradebookAssignments.iterator(); i.hasNext();) {
                                         assignment = (Assignment) i.next();
...