PhD Application Review moved from Fall 2015 Start to Spring 2016 Start: Options?
I think given the amount that I know from your post, I don't think we can give you more advice than to ask for clarification.  This isn't a standard procedure that I know of, though I could imagine various reasons this could happen.  Since I'm just imagining (and I'm sure you are too), just write a polite email to the director of the graduate program, or whichever faculty member seems to be the correct contact, and ask them precisely what this means for you.