As far as I know, there's no priority given to applications submitted prior to Feb 2008. The process is as it's scheduled on the CIC website; it's different from office to office.
"The changes apply only to applications received on or after February 27, 2008, the day after the federal budget was introduced."
http://www.cic.gc.ca/english/department/media/releases/2008/2008-06-17.asp