According to TVinfo, a German TV schedule guide, Mr. Pigeon 72 will be airing on May 28th on Disney Channel Germany at 6:55pm Germany Time (12:55pm EST). This is the 4th episode of Season 4 following Gang of Secrets. The synopsis for this episode reads:
Mr. Pigeon is akumatized for the 72nd time, but this time he can turn people into pigeons!
We also know this is the episode where Ladybug learns about the Lucky Charms and the new Suit we have seen in Monster Fu. The Calendar and Countdown have been updated!
UPDATE: Mr. Pigeon 72 has been removed from the scheduling site meaning Disney Channel Germany does not have the episode and decided not to air it on May 28th. We no longer have a confirmed date for this episode.