Finally, an updated from Citizenship and Immigration Canada! This CIC page was last modified June 6, 2014 and the posted information about applications received was as of May 4, 2014. Please note that the number of complete federal skilled worker applications received is just an estimate - not a real-time tally.
So far, it looks like Financial and Investment Analysts (NOC 1112) will be the first to reach the cap with 43 complete applications received.
As of May 1, 2014, there is an overall cap of 25,500 for new federal skilled worker applications. This includes a cap of 500 applications from PhD students. There are also sub-caps of 1,000 for each of the 50 eligible occupations.
For updated number of applications received under the Federal Skilled Worker Program, visit http://www.cic.gc.ca/english/immigrate/skilled/complete-applications.asp