Benk and Roswell1976,
I think it depends on which local office you file is at. From what I saw on the forum the timelines really differ from office to office across the country. I would recommend looking at timelines of other applicants in your local office who applied earlier in 2014.
An example from Ottawa office I observed: in the end of April an August applicant had a test. Very recently a September applicant received a test invite for early May. One would speculate then, that October/November applicants from Ottawa should have a test invite in June/Jule...
But that's just a guess on my part though
I don't think anyone can tell you with certainty when the test invite will arrive. Just keep studying and be ready!