Niantic launched a new year event for Pokémon GO with a new statement. The event, which will run through Christmas time, will continue from next Sunday morning until January 3, 2017. During this event you will gain more and more important gifts than PokéStop regions. Also, from the eggs you can earn from these spots, the rare mobile monsters like Togepi, Pichu, will be able to come out with higher probability.
Apart from all these enhanced gifts and rare creatures, Pikachu, who previously added the Santa Claus hat to the game, will face a much higher rate during this event. When this event is over, Pikachu with Santa Claus hat is likely to be completely unavailable in the game. Until the next Christmas event.