There's really not a reason to expect the number of ITAs to go up unless you have information that the percentage of rejected ITAs has been higher than expected.
Obviously I'm just assuming. Rejected ITAs could play a role, and if you factor in that number from January - August, you can easily assume that there would have been a good amount for whatever reason. Also, if CIC continues at 3600 through the end of the year, they will not meet their targeted quota.
I don't have any inside information, just making PURELY obvious assumptions.