If I'm to choose DLC theme, I would prefer Nine Hells, Snow zones, grim rainy forests, but defintely not Githayanki theme, I don't like their culture & how they look, not to mention their behaviour, though their behaviour is a good reason to kick their skinny butts.
First, Vlaakith, then we will kill all nine archdemons of Hell bowing before Raphael, and in the end we will take away the crown from Raphael!
We will travel between the planes, and Laezel will fly on his personal red dragon.
The first DLC will raise the level cap to level 16, the second to level 20. We need an epic adventure!