There are a few things. For one there's the platforms on which the politicians are running, but that's mostly old news; so what about the rules? Yeah, the rules of the vote. No, we didn't finally pass voting reform. There will be no proportional representation in this election, but there is an important rule that has changed...
Do not eat your ballot!
So there you have it; you can still enjoy eating your provincial election ballots, but don't try those games at the federal boxes. I should, however point out that it is legal to spoil your ballot. My favourite thing to do is make clever use of the 4 circles they give you. I'm sure you can find a four letter word that might accurately sum up your feelings for a federal election... Just remember that a spoiled ballot is counted, but a refused ballot is simply a "no vote" and doesn't account for a thing.
Cheers to the wacky Canadians, they'll have to be more creative in fighting democracy!