Thanks to the marketing between Robert Downey Jr. and Marvel Studios on Twitter, everyone can watch the next Marvel film, Avengers: Infinity War a week early, April 27th.
As for what reason why the early release, no one really knows. However with Deadpool 2 coming out May 18th, this maybe a way to give more time between the two movies, now that the Deadpool movie license is under Disney. Movie sites such as Fandango have not updated the release date but expect a change soon before pre-orders open up.