Board Thread:Destiny Forum/@comment-26938201-20151121075644/@comment-25926749-20151121130016

I don't know about Kinetic subclasses. They sound awesome, but then again, ReD is right; Guardians draw energy from different sources of light, each having some implementation in the fabric of the universe (Void, Solar, Arc.)

Truth be told, the only way new subclasses would arise is if

A. We found a new type of light to use,

This one seems more likely of the two. I don't see how it could work, but the Traveler is a mysterious being. Maybe it's hiding another type?

OR

B. Found a way to channel Darkness as powers for Guardians.

I highly doubt this one. But, if Bungie wanted to, they could make this work somehow. Specially since some Guardians delve into mysticisms of Vex and Hive. Notice, however, they are dead.