After extensive data mining, I found out what Destiny's next DLC after TTK will be.
"A new foe has risen, risen where once mankind stood. He stands shrouded by smoke, and complemented by colour."
I, naturally, was intrigued when I found this in the raws. After some scouring I discovered repeated mentions of Spirit Bloom and "7 by 60" in the raws for this new DLC.
I eventually discovered text for the raid:
[spoiler] [object set: boss] has come for your potato chips. Silence his reggae.[/spoiler]
Who is [object set: boss]? What is it? Well, it's the raid boss, whom I found out to be:
[spoiler]None other than Bob Marley[/spoiler]
What's the name of this mystery DLC, which I now know is going to take Vex Void's place?
[spoiler]The Jamaican King[/spoiler]