**Update** a community member has shared that her store manager told her that the warehouse sale was a hoax discussed by upper management on a conference call. Apparently they decided to 'put it out there' and the news of a warehouse sale spread like wildfire. I'm not sure if this is valid information or not so as of right now, the warehouse sale for 2017 is still unconfirmed.
Word on the street is that there will be a Lululemon Warehouse Sale on January 12, 2017. This should be an online sale for both US and Canada. I had a reader mention in the comments a theory that the boxing day sale was so light because Lululemon was strategizing having a warehouse sale AFTER the holiday return period on January 8th, and before the next earnings report, maximizing full price sales for as long as possible before those items are out of season.