The Russo's to direct Avengers: The Infinity War

Captain America: The Winter Soldier directors, Joe and Anthony Russo, have officially been hired to direct Avengers: The Infinity War - Part 1 and Part 2. This isn't much of a surprise as they also were selected to direct Captain America: Civil War. Also in talks for The Infinity War are screenwriters Christopher Markus and Stephen McFeely. The pair has written scripts for all three Captain America films along with Thor: The Dark World and ABC's Agent Carter.
The Infinity War is going to be the biggest production yet as both parts will shoot back to back in 2016 and 2017. Part 1 is set for a 2018 release while Part 2 is set for 2019. 

A random sidenote, but this also confirms that Joss Whedon is indeed finished with the Marvel Cinematic Universe. He previously stated that Avengers: Age of Ultron would most likely be his last Marvel film and that seems to be true. He wants to move on and start doing some more original projects. Sad day.