Spirit of Harmony is the new elemental material and will be the only elemental in Pandaria.
It behaves like previous elemental, it is collected in the form of Motes of Harmony, using 10 motes produce a Spirit of Harmony.
It is Bind on Pickup, hence no more elementals market, if you need it, go out and farm. May become BoA in the future but so far is all speculation, it looks like will never be unbound though.
While is true that at some point other elemental materials were datamined and we observed Spirits of Autumn, Spring, Summer and Winter, these never made it into the game as Blizzard has decided to scrap the elemental separation and go for a single elemental, probably as due to various reasons the various elemental types had a very different rarity; in Cata Earth jumps into your bags while other elementals are harder to come by.
Motes of Harmony can be found as a random drop or can be obtained once Revered with the Tillers by planting a Songbell Seed, which when ripe rewards a mote.
For gatherers who have no need of these for crafting, Spirit of Harmony can be used in the Vale of Eternal Blossom to buy trade goods. Vendors can be found on the terrace of your faction's temple, next to the riding trainer. The Alliance trader is Krystel, while Danky works for the Horde.
The vendors will let you trade in a Spirit of Harmony in exchange for a choice of:
1 Ironpaw Token
1 Restored Artifact
1 Starlight Ink
20 Windwool Cloth
1 stash of 20 random Pandaria Herbs
3 Golden Lotus
20 Spirit Dust
5 Mysterious Essence
1 Ethereal Shard
20 Ghost Iron Ore
20 Kyparite
5 Black Trillium Ore
5 White Trillium Ore
20 Exotic Leather
20 Prismatic Scale
1 Serpent's Eye
>READ<
This is a comment on Wowhead i found and posted here - i take no credit for this at all.
http://mop.wowhead.com/item=76061#comments:id=1700220
Credit goes to the wowhead member "degre".
I just thought this would be useful for all of you with Jewelcrafting so i decided to share it.