After winter 2011, they haven't approved any university application except for 1. CHC has definitely decreased the visa quota for Pakistan and that is why they are not issuing visas anymore. From the excel sheet one can see that they have only issued 1 visa in 2012 so far. Though this sheet is not the list of all applicants but over the sample size of 30 our assumptions won't be that wrong.
If you see the CHC islamabad status for Fall 2011 they have hardly rejected any visa but this time things are different. Hope for the best but I fear the worst.
Still I am hopeful that they will expedite their process as for fall 2011 they started issuing visas mostly from the mid of July. Still I believe CHC Islamabad should start calling for medicals.