The issue of whether CSIS has extraterritorial powers is a matter that has actually been under litigation under the act before Bill C-44. Justice Blanchard said in a decision that it didn't have extraterritorial powers. Justice Mosley—and here my interpretation is a little bit different from Professor Leuprecht's—actually said that it did have extraterritorial powers. He only drew it back when he found out they were using the Five Eyes to exercise what he had authorized as extraterritorial CSIS investigations.
When I say “new powers”, I mean this a matter of legal dispute. Leave to appeal in the Justice Mosley decision is now, I understand, being sought from the Supreme Court of Canada. It is possible the Supreme Court of Canada will hear that case, we really don't know right now.
When I say “new powers” I mean black letter law, new powers that spell it out.
But you're right that the Attorney General of Canada has argued that in the existing CSIS Act there are powers for CSIS to conduct investigations outside of Canada.