John Ivison at the National Post is now speculating that the Tories are considering proroguing parliament for the 3rd year in a row. While I did not object to either of the first two prorogations, after the fuss the pinko bike riding communist kooks made over last year's edition, it would be silly to do it again right now. Ivison's theory is that the government likes making throne speeches, and this allows them to resume parliament with a new throne speech. There is no specific reason to prorogue (like a socialist/separatist coup or the Olympics), John just speculates that they want to do it for purely partisan reasons.
There is no reason to prorogue right now. Bob Rae did it almost every year he was Premier, and he was one of the worst leaders in our nation's history. Prorogue when you've got a reason. Don't just do it because you want to present a new throne speech.