An upcoming Rock Band 4 expansion will bring synchronous online multiplayer to the game, according to developer Harmonix, when it launches in “holiday 2016.”
“Synchronous online multiplayer will be like Quickplay, modified to provide a fair and streamlined experience for console friends looking to play Rock Band 4 together online. We’ll be implementing enhancements on the back end to address issues for folks who don’t have the same DLC libraries and want a more fluid process for choosing songs together as a band.”
-Criss Burki, Harmonix community manager
The Cambridge, Mass.-based developer promised to provide more info on online multiplayer and other unannounced features at E3.