I have sent an application to defer my admission in waterloo University.what are the chances?

I have recently been accepted in University of waterloo for MEng Program for fall 2010.
Actually the visa process in my country takes some time therefore i have sent an application to defer my admission to WINTER 2011. What are the chances of my deferral as i have a solid reason of not being able to attend University for fall 2011.

Due to your reason and assuming it is valid you do have a good chance to defer admission./