Pokémon Shuffle Version 1.1.5 is available for players of the game and the patch adds the Keldeo Special Stage and the Pachirisu Daily Challenge Stage. New main stages 151 to 165 have also been added to the game. The Keldeo Special Stage will be available to play between March 23rd, 2015 until April 6th, 2015. 5 New Daily Challenges were also added and will run March 23rd, 2015 until April 20th, 2015! Pachirisu, Farfetch'd, Tropius, Sigilyph, and Druddigon each appeared on different days while Meowth returns on the weekends.
Details of these events have been added to our Pokémon Shuffle Special Event page.
As a thank you gift for reaching 2.5 million downloads of Pokémon Shuffle, players that Check In will receive a
Disruption Delay (オジャマガード) item.
Sources:
http://www.pokemon.co.jp/ex/poketoru/news/post.php/24/,
http://www.pokemon.co.jp/ex/poketoru/news/post.php/25/