Board Thread:Plants vs. Zombies 2: It's About Time/@comment-25089892-20141217192925/@comment-25089892-20141217210543

Strange. There was even info about some "money prizes" on AB Forums:

"Additionally, at least twosites are reporting that Rovio will be offering a present to all Angry Birds fans via Google Play. As stated, entering the code: “ANGRY-BIRDS” in the following Angry Birds games will redeem a reward worth $5.00 USD:
 * Angry Birds
 * Angry Birds Rio
 * Angry Birds Seasons
 * Angry Birds EPIC
 * Angry Birds Friends
 * Angry Birds Transformers"