For those of us with applications on hold to NPSIA. I spoke to Tabbatha today and confirmed what it means.
Being on hold means that your application has been deemed admissible to the program, however not high enough to be included in the first round of admissions. Applications on hold will be looked at for second round admissions that will likely occur in May (potentially April). I believe this is based on how much space opens up in the program after the first round. There isn't a wait list and those on hold are not ranked.
There isn't much to do apart from wait until May.