This morning, yet another update for Pokémon Shuffle was released. This version 1.1.2 can be downloaded via the check-in feature, and will allow you to get access to a brand new event featuring Kyogre. This event, which is the only way to get the Legendary Pokémon, is playable until March 23rd (6AM UTC). The first time you play it, you will be rewarded with a jewel.
As for the Mew event, it’s been prolonged by two weeks, and will end on the same day as the Kyogre one: on March 23rd at 6AM UTC.