Many thanks to @obesacantavit for tweeting the link!
The TIFF site has posted a page for the event, In Coversation with… Keanu Reeves. As previously noted the appearance is on Sunday, January 11, 2015 and it is listed to start at 3:00 PM. Tickets went on sale today for members and will be available for the general public on December10.
The announcement is here and ticket info is here.