Google Sending Out Gifts to Google Maps Pokemon Masters

According to Android Police, those who completed the Google Maps Pokemon challenge on April Fools Day and found all 151 Pokemon will be sent a gift in the mail from Google. Once you fill out your contact information, Google promises to send it in 4-6 weeks. What do you think it will be? Maybe a promo card? A code to download a Pokemon? Something related to Google?

Google Maps Pokemon Challenge