Kalven at Kal’s Corner posted today about the new Darkmoon Card of Mists Trinkets that will be available in Mists of Pandaria: “I just noticed that the rewards for the Darkmoon Card of Mists decks are up on Wowhead. All but the tanking trinket have primary stats as both passive and as a proc. This makes them very potent indeed, and maybe BIS for a few patches. [...] Also important to note is that these trinkets will not be available until Oct. 7th, when the first Darkmoon Faire of the expansion begins. That leaves 12 days in which to level up Inscription and start grinding out cards.” . . . Read full article
For hunters, the Darkmoon trinket of interest is the ilvl 476 Relic of Xuen. Note that there are two versions of the Relic of Xuen: a strength version and an agility version. The trinket is a reward from the quest Darkmoon Tiger Deck. Cards to complete a Tiger Deck are randomly created by inscriptionists when they craft Darkmoon Card of Mists. Cards, decks, and trinkets are all BoE and can be traded in the Auction House.
For a full list of hunter PvE trinkets available in MoP see MoP Hunter Gear Guide: Trinkets.
Screenshot is from Wowhead.