Shortly after the April update, a mysterious Reddit user named Rezyl Azzir dropped a post on the Destiny sub with instructions on how to collect a dead ghost inside the prison of elders. When players searched the area, they found the dead ghost that tells the tale of Rezyl Azzir along with some Latin that translates to the following:

"The twentieth day of the ninth month. IT is coming. Forward, to the stars."

Many have theorized that this is the release date for the next major expansion, which would make sense as that's roughly the same time the Taken King came out. Nothing is known on what the expansion will contain, but many feel that this time around we'll be focusing on the Cabal, as they've been pretty much relegated to the background for most of the previous DLC's.