If they annonce something it will probably be About The Comet Expansion whos among destiny community a Polishinel secret.
Comet is a big expantion, Downloadable or and can Buy the Disk.
-12 story mission
-new pvp map and mode
-3 new subclass one for each character
-1 new world to explore(The Hive Ness World|ship)
-2 raid
-4 strike
That pretty much what have been data mined so far from the same people who leaked accurately, Cropta Dlc and House of the Wolf DlC.