A DLC for each D&D supplement, for example the Eberron DLC would include the following:
Races: Warforged, Shifter, Kalashtar, and Changeling
Classes: Artificer
Other Character Options: Dragonmarks
The Ravnica DLC would include the following:
Races: Loxodon,Simic Hybrids, Vedalken, and Viashino
Subclasses: Spore Druid, Order Cleric, etc.
Other Character Options: Guild Backgrounds
etc. etc.
