I was thinking about what the devs said not too long ago in a podcast about entertaining the possibility of clerics getting their domains. Personally, I'd love to see it, since the cleric class is extremely bland and has nothing special to call their own except being slightly better at turning undead than paladins and having the only real healing enhancement tree.
It wouldn't take much to add domains. I mean, the tech already exists in the forum of warlock pacts and deity feats.
Healing Domain
Cleric Level 1: You automatically gain the Empower Healing metamagic feat
Cleric Level 5: +10 positive energy spellpower
Cleric Level 10: +5% positive energy critical hit chance
Cleric Level 15: Panacea spell-like ability (SP cost: 20, cooldown: 5 seconds)
Magic Domain
Cleric Level 1: +35 maximum spell points
Cleric Level 5: +10% spell critical damage
Cleric Level 10: +35 additional maximum spell points and +5 universal spellpower
Cleric Level 15: Cometfall spell-like ability (SP cost: 35, cooldown: 15 seconds)
War Domain
Cleric Level 1: +1 attack and damage, +1 additional attack and damage with favored weapons
Cleric Level 5: +3% doublestrike and doubleshot
Cleric Level 10: Your weapon and unarmed attacks inflict an additional 2d8 light damage
Cleric Level 15: +1 critical multiplier on attack rolls of 20
Death Domain
Cleric Level 1: +10 negative energy spellpower
Cleric Level 5: +5% negative energy critical hit chance
Cleric Level 10: +2 to the DC of your necromancy spells
Cleric Level 15: Inflict Critical Wounds spell-like ability (SP cost: 16, cooldown: 6 seconds)
Sun Domain
Cleric Level 1: +10 light spellpower
Cleric Level 5: +3 turn undead uses
Cleric Level 10: 25% light absorption
Cleric Level 15: Increase the maximum hit dice of undead turned by 6 and you count as 6 levels higher when turning undead
Protection Domain
Cleric Level 1: You gain proficiency with tower shields and gain +5 armor class
Cleric Level 5: +1 to all saves
Cleric Level 10: +5% maximum hit points and your unconscious range is extended by 25
Cleric Level 15: +15 physical resistance rating and magical resistance rating
Travel Domain
Cleric Level 1: Action Boost: Sprint; activate to run 50% faster for 20 seconds. 5 uses per rest
Cleric Level 5: +5 to the tumble and jump skills. Additionally, you gain the mobility feat whether you qualify for it or not.
Cleric Level 10: The spell Dimension Door is automatically added to your known level 4 spell list
Cleric Level 15: You are now immune to slippery surfaces and most knockdown effects; this can be toggled on to float as if affected by the featherfall spell.
Knowledge Domain
Cleric Level 1: +1 to all skills
Cleric Level 5: +6 sacred bonus to saves versus illusions and enchantments
Cleric Level 10: You are now automatically affected by the True Seeing spell and your weapon and unarmed attacks automatically gain ghost touch
Cleric Level 15: +5 to the use magic device skill. Additionally, you have a 15% chance to retain a copy of a scroll when using it.
Watcha think?