One of the issues with not being able to regenerate mana through multiple potion consumptions rests on the shoulders of the % based spell costs. Granted Death Knights, Hunters, Shadow Priests, Shamans, Druids etc can provide mana to their groups. But with polymorph being 12% of your base mana I forsee a rise in the amount of mages that will refuse to resheep targets for fear of going OOM. Not to mention that this change kicks arcane mages right in the buns, and with that being one of the better looking trees at the moment (synergy with fire talents in the new build ftw) it makes me wonder how it will all work out. That being said with some of the gear peices that have been displayed with tons and tons of spirit on-board we might all be regenerating mana faster than we can spend it...bahhahah. Too bad we can't wand-spec anymore...that may be our only sustained dps option.