CIC just replied to 6 tweets to 6 different people with the one same answer "The first round of invitations will take place before the end of January."
I don't understand why they're using one generic answer, even people are being so specific that "today is last working day of January. This is so confusing. I think they are teasing us. :'( :'( :'( :'( :'(
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.