The only valid and known reason for the delay is that CIC has updated proof of required funds, and all candidates will be reassessed under the new requirements.
More details here -
http://www.canadavisa.com/canada-immigration-discussion-board/here-is-why-first-draw-isnt-declared-yet-t267954.0.html
What CIC has to do is make an announcement, assuming that they are delaying the draw.
It is highly unlikely that they will hold the draw on a Saturday.
This is my understanding