No, this is not an article about Paladin’s in dungeons, this is all about water-based dungeons, inspired by this post from a Blue on the US-boards:
We typically never throw anything completely off the drawing board when it comes to conceptualizing fun content. I think there would have to be a good opportunity for a water dungeon in the game first, but more importantly, we’d have to really make sure it would be done right and feel fun. Under water combat can be a little chaotic, especially when using any sort of ground-targeting spell. We wouldn’t want to come out with such content were it to feel like the game play would suffer from the format of the setting.
<snip irrelevant banter about Wintergrasp>
The Blue in question, Zarhym, states there need to be a good opportunity for a water dungeon, but doesn’t rule out the possibility. Well, what better opportunity than an expansion revolving around the Maelstrom?
A water-based dungeon could have all kinds of neat stuff, like 360 degree battles, imagine a giant squid battle where the squid uses his ink to make the water all black, the overall dungeon atmosphere and visuals would be breathtaking.
Knowing Blizzard and how they like to have content as available as possible for everybody, there would probably be an npc at the entrance giving people an under-water breathing buff for as long as you remain in the dungeon. I doubt you’ll get an item for that purpose since that will take up a valuable gear-slot on your character. Then again, it would be neat if the npc would give you some choices for an underwater breathing device, let’s say a trinket, a headpiece or a belt to make it interesting. Maybe even a small quest you need to do before you can enter the dungeon, with as a reward one of said items so that you can put an enchant on it.
Going back to the idea of the npc and his underwater-breathing buff, this gives all kinds of possibilities for underwater fun. Maybe the buff runs out after 15 minutes and there’s a certain spot in the dungeon where another npc is for a new buff, you’d have to get there before the timer runs out. Would make for a great pacing-mechanism if you ask me. And ofc, to circumvent this buff-timer there are plenty of options, a warlock, an engineering diving helmet, the kalu’ak fishing pole, underwater breathing potions, druid aquatic form, one could even try to outheal the drowning damage 
Ofcourse, the dungeon wouldn’t have to be completely under water, there are plenty of ways to put in normal cave areas filled with murlocs to keep you busy J
Any either way, if they implement an underwater dungeon, “Don’t forget to bring a towel*”
*quote from Burs, Blackrock-US
