As predicted, Enhancement Shamans got some nice buffs yesterday, including the addition of a Mortal Strike-like effect of reduced healing to the Flametongue weapon.
But the weapon hasn't quite had the desired effect yet on the PTR. In fact, as World of Raids has posted, it actually does exactly the opposite. As you can see above, Flametongue is actually adding to heals on the target of the attack, not halving them as its now meant to. No doubt this will be fixed before long, but a note to whoever's working on the Shaman class on the PTR: you should have used that minus sign in the code there, not the plus one.