I also applied for York this year. After they received all my application materials, they told me the process will last 4-6 weeks. After I got the admission from Ivey, I called York. At first, a clerk answered my call and told me my application was still under process ( just like what they told u). But after I told her I got admission from Ivey and I would like to know their decision ASAP, she transfered my call to an admission officer. I got the admission from them on the next day and I finally chose not to enroll.
But, I think now your situation is much different than that of mine for 2 reasons. 1. Seems you have not got any offer from other programs by now; 2. Now it is already mid-May. So, I think the best thing you can do now is just take it easy and wait. Since the York's ratio accepted students who enrolled is not so high (65% last year), you still have a very good chance to get a place in that program.
BTW, could you tell me your TOEFL and GMAT score?