why would an application get rolled if they dont have limits anymore of how many they can take per month?
warning: this post is pretty much entirely speculation
IMO what seems to happen ...
An OR might tell you that you will be seen because you submitted your package to him/her/processor before the end of the month deadline. But then either your OR or processor or FedEx take longer than expected to get the package to its final destination. Then the OR just tells you it was rolled, when it actually hadn't gotten there in time.
In other rare cases that I have read about here on AW ...
A package has been 'tabled', which means that the board looked at the package, but wants to look at it again the next month against some different packages. Good candidate, but tough competition, so check again the next month. I heard this a few times back in March I believe it was.
All-in-all I think the 'rolled' concept is largely based on your OR. In the two times I submitted my package, my recruiter was very straight-forward with me with regards to what was needed and where my package was. The months that he told me we were submitting for, were indeed the months that my package was seen.
Hope that helps.