Hi, I can present a thought to explain this situation.
When they started checking FSW 2014 application in June and July I don't think a lot of case officers at CIC were put on FSW 2014 program, as the focus was to first clear pending FSW 2013 cases at the earliest, plus in that timeframe annual (fall) student visa cases are also handled. These students leave for Canada in August or so, each year.
A lot of case officers have now (September onwards) been deployed on FSW 2014 cases, since some are freed up from FSW 2013 and may be some more from other programs like student visas etc. FSW 2013 applicants are mostly at VO stages now (if not already in Canada, by now) and (fall) students applying to Canada are either in Canada already or have been refused a while back. So nothing pending there!
Since there is a lot of application pending from FSW 2014 and resources at CIC are somewhat available, the focus is on FSW 2014 and hence the higher 'update' numbers lately. This should likely continue till either the outstanding (as in, outstanding for evaluation at CIC) applications for FSW 2014 decrease substantially or a new program at CIC starts (like Express Entry, may be), where the focus needs to shift post receiving large number of applications there.
The above is my line of thought on the asked question.