Remember, your presenter was trying to encourage attendees to look at the SAR publications when they come out, saying that sometimes they contained some good stuff?
Later, he mentioned that the change was actually reiterated in the most recent set of SAR instructions:
4. Continuing Reports: A continuing report should be filed on suspicious activity that continues after an initial FinCEN SAR is filed. Financial institutions with SAR requirements may file SARs for continuing activity after a 90 day review with the filing deadline being 120 days after the date of the previously related SAR filing. Financial institutions may also file SARs on continuing activity earlier than the 120 day deadline if the institution believes the activity warrants earlier review by law enforcement.