Hey,
With the new Tannan Jungle region in 6.2, their's a new faction called the Vol'jin's Headhunters (Horde version).
This faction has an awesome item available at "Friendly" reputation level (very quick to reach if not instant) that allows you to place a banner that will heal your whole group for 5% of their HP every 2 seconds, during 30 seconds (totaling 75% healing).
The awesome thing (and why I posted this under exploits) is the fact that you can place this item anywhere, like in raids, battlegrounds, etc... without limitation, while other items of this type would be limited to "Outside in Draenor" for example.
With this, if you whole raid places it at the same time, with 20 active banners, you're pretty much invincible since you'll get an insane amount of healing during 30 seconds (note that I haven't tested this yet, but you can definitly place it in raids).
So, here's the guy selling the item : Shadow Hunter Denjai - NPC - World of Warcraft He's unlocked after doing the first few quests of the 6.2, once you unlock the main village in Tannan Jungle
Here's the item that you have to buy : Vol'jin's Headhunters Battle Standard - Item - World of Warcraft It only costs something like 50 golds, so it's accessible to anyone.
I think it can be a great help in the new raid
Hope it'll help you.