Let's get the bad news out of the way first: We've already lost Path of the Devout on beta. The good news is that in its place, we now have Feathers From Heaven, a talent that allows priests to lay out a little track of speed-boosting feathers. Think of them as those little speed arrows in Mario Kart, only they're feathers, and you can put them wherever you please.
The individual feathers have no expiration that I can tell, so you can lay them out in advance on one end of the room for special tactics in your raid encounters or PvP, if it suits your fancy. The ability has no mana cost at the moment. Instead, it is limited by charges: one feather per charge, and you can have three charges at a time. You can place one feather right after the other, but it takes 10 seconds to restore one charge. This allows you to spam three of them on the ground in succession if you like (something you can't do with Body and Soul) or spread them out gradually ahead of you in your path. They can be used by any friendly target, not just party members, so be mindful of people's stealing them if you're using them while leveling to snatch up quest items. Oh yeah, and the feathers can be used on top of water with Levitate.
So, you're excited about Mists of Pandaria now, right?