At BlizzCon last week, Blizzard unveiled its plans for an entirely new talent system in Cataclysm. Designed to try and eliminate cookie-cutter specs, the new talent system includes practically no DPS-increasing talents and focuses mainly on utility. (Don't fear losing some of your familiar talents; those are being rolled into the specs you choose at level 10.)
Part of the problem with utility talents is that they tend to gravitate toward becoming PVP talents, particularly when you reach max level. Sure, Frozen Power or Earthgrab Totem might be excellent for soloing, but at level cap, you rarely do much soloing. And the soloing you do do comes in two forms: soloing old raids, where the mobs would be immune anyway; and dailies and quests, where heightened gear levels will eventually allow you to blow away mobs in a Windfury proc.
That said, some of the tiers look like they will have potential. As a result, I'm going to do my best to keep my doubts about whether or not we'll actually be able to utilize some of this utility in check, and do a tier-by-tier review of the talent tree for enhancement in Mists of Pandaria. Please remember, these are all subject to change ... and hopefully, some of them do. (I highly recommend keeping up the Mists of Pandaria talent calculator in another tab while reading this, as since most of these spells don't exist yet in game, I can't link to them like I normally would.)