Bungie is developing a system called Prism, allowing players to mix and match abilities from different subclasses, a feature being worked on during the delay. Picture throwing a lightning grenade while using solar abilities, or triggering Devour while rampaging with Stormcaller.
Moving on to Destiny 3: It's under the codename "Payback." A significant change is the removal of classes, allowing any character to specialize in any ability, justified by lore (Hunters learning blink from Warlocks, for instance, with blink not tied to a specific element). Luke Smith's (Bungie lead) choice of words strongly suggests Destiny 3 is in the works: "Facing the witness is not the end of Destiny 2, and it's definitely not the end of Destiny. After you face the witness, we're gonna tell you what's coming next to Destiny 2 and beyond…we'll see you soon."
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Moving on to Destiny 3: It's under the codename "Payback." A significant change is the removal of classes, allowing any character to specialize in any ability, justified by lore (Hunters learning blink from Warlocks, for instance, with blink not tied to a specific element). Luke Smith's (Bungie lead) choice of words strongly suggests Destiny 3 is in the works: "Facing the witness is not the end of Destiny 2, and it's definitely not the end of Destiny. After you face the witness, we're gonna tell you what's coming next to Destiny 2 and beyond…we'll see you soon."
Source
