Just keep your eyes peeled on the koodo mobile website. If you use facebook you can join the Koodo page and they will inform you of any promos if there are any available. Looking slim to non right now since they're promos in 4 provinces going on right now.
That's like asking Apple when they will release the new iPhone. They won't tell, you just have to wait and see! Anyway, there's no contract with Koodo, therefore you can change your plan when the deal is out!