Every Sunday (usually), Spiritual Guidance will offer practical insight for priests of the holy profession. Your host is Matt Low, the grand poobah of World of Matticus and a founder of PlusHeal, a new healing community for all restorative classes. Spirit nerf's are coming! Is it really doom and gloom for the Priest class?
Eliah did a terrific job summarizing the mana regeneration changes that are slated to strike in 3.1. The general feeling I'm seeing right now among the Priest community appears to range from the "OH NO! NO MORE MANA" to the "Eh, guess I better load up on Mana Pots since they're cheap".
On a side note, when is the last time you had to pot in a raid? And I don't mean from immediately being revived in the middle of a fight. I distinctly remember running out of juice on Kel'Thuzad a month or so ago.
In any case, there are some rumblings abound as to what sort of impact this nerf would have to our playstyle. The better question to ask is what impact this nerf would have to our gearing, gemming, and enchanting choices.
The underlying point that seems to jump out at everyone is that Spirit regen is being decreased.
Let's see what this implies for the Discipline and Holy trees respectively.