Attique, I applied on 2nd june, and I think i will also have to defer my admissions. Frankly speaking, I'm also very confused like you as to what would happen. However, from what i have heard on this forum, if our visa is accepted CHC will issue us temporary visa. When we arrive at Entry port in canada, we will get our study permit there, which means the dates of semester etc are not stamped on our passports here. Therefore, i think ( this is just my assumption) if you get temporary visa, you can always update CHC with revised letter, which you will also show in canada.
Regarding, your case specific email, i have sent a ton of emails and none of it ever gets replied to, except for an auto-generated email which says thank you for your patience, your file is under review.
Secondly, i have been told on the forum here that if the decision of our visa takes a lot of time and CHC realizes that the entry dates for our classes have passed, they will request us for revised letter of acceptance (which in our case would be new offer letters for Spring semester).once we supply them the letter they will issue us temporary visa.