Playing the beta I created a character of level 50 of each healing class, and I could notice that the mana cost of some spells does not correlate with the updates raised in wowhead, consuming less mana than it corresponds, here are the numbers. Here the percentage based on base mana (without any equipment on)
Holy Paladin:
____________________According to wowhead _____________ In the Beta
Crusader Strike ------------------------ 14% ------------------------------- 2.8%
Holy Shock------------------------------- 14% ------------------------------- 2.8%
Holy Prism --------------------------------18% ------------------------------ 2.6%
Resto Druid:
____________________ According to wowhead_____________ In the Beta
Efflorescence ---------------------------17%--------------------------------3.2%
Rejuvenation----------------------------11%---------------------------------2.2%
Lifebloom---------------------------------8%----------------------------------1.6%
Wild Growth-----------------------------22%---------------------------------4.4%
To avoid lengthening the post, this also happens with the shaman. Using the same calculation in the Holy Priest and Monk spells the mana cost,at least in their basic spells is correct.
Pdt: Even though I have the beta I can’t post in the forum. If someone wants to corroborate the data, I leave the link on which I base myself.