I have high hopes for the Watch Post package. In fact, I expect at least one of the watch posts will get nerfed in time. I think it's that good. I believe either rogue, priest or paladin will be the best watch post deck. Here is my take on the paladin version.
As we all know Libram Paladin is already a very solid deck and almost the only thing we do here is add the Watch post package which consists of Far Watch Post, Mor'shan Watch Post (the third watch post: Crossroads Watch Post sucks) and Kargal Battlescar as an end game card. I have very high expectations of the watch posts. They are annoying enough that your opponent needs to deal with them. Because of their high health that won't be easy. An extra benefit is that Far Watch Post messes up combo decks. Fantastic!
Libram paladin received some very welcome card draw in the form of Knight of Anointment which draws a holy spell (librams are holy spells). When our new friend Cariel Roame attacks he discounts your holy spells by 1.
Let's say you play turn 1 Knight of Anointment, turn 2 Far Watch Post and turn 3 Mor'shan Watch Post and somehow your opponent managed to kill everything (which is almost impossible to do), then don't you worry, because on turn 1 Knight of Anointment drew you Rally! which is also a holy spell, and you can revive every card you played on turn 4. That is 3 minions and 6/10 worth of stats with an immediately active ability that frustrates your opponent. On turn 7 Kargal Battlescar will give you two extra Lookout's.
That would be the dream, but even if you don't get that lucky, we still have the strong libram deck which also works pretty well.