The divine sphere on the ED map is just BEGGING for a third ED.
Personally, I'd like to see a divine ED that has:
1) Enhancements and alternate uses for the Turn Undead feat, such as turning outsiders, debuffing affected mobs, etc.
2) Increases to caster level and/or spell DCs for divine spells.
3) Crowd control abilities
what do you all think?