If we are to use Immigration Minister's twitter message as the basis, the FSW final guidelines will be announed in the first half of 2013. That's between January to June 2013. Here's a screen shot of Mr. Kenny's twitter message.
But this is not consistent with the Nov 2, 2012 news release from Citizesnhip and Immigration Canada. According to the news release, the final regulatory changes will be available in the Canada Gazette later this year.
It begs the questions, which is which?
Either way, you must be ready at all times.