If you can not apply until October and you are marrying the bf in December, it makes sense to me to wait with the papers until after you get married. However, applying in October and then sending an update to say that you are married will also work. Maybe it will delay your application a bit.
If you do not want to include the boyfriend in your application but you want to sponsor him later, then you can not marry him until after you get your PR. According to
http://www.cic.gc.ca/english/information/times/perm-other.asp it takes 12-13 months to get an OWP and another 15 after that to get PR.