It looks like Angry Birds 2 might already be out in a soft launch in Canada under the title Angry Birds Under Pigstruction. From Pocket Gamer:
It’s a poster advertising Angry Birds 2, and makes reference to a chance of “golden duck showers”.
The only references to golden ducks in previous Angry Birds games is a level named after them, and the new Golden Duck spell in Angry Birds Under Pigstruction, which showers the level in, you guessed it, golden ducks.
Via Pocket Gamer