Spellpower bonus will be very important for casters in Warlords of Draenor

While answering another question, Celestalon commented about the importance of Spellpower for casters and says the spellpower bonus is huge.  While spellpower has always been pretty important for healers, the impression I am getting is that healers are going to want to get those upgraded weapons asap – although in many guilds, raid leaders tend to prioritize weapons to DPS first over healers.

With changes being made to spirit and mana regen, it wouldn’t be surprising to see spellpower tied into mana regen somehow.

If this means all dmg spells and heals will scale with primary stat, this is a good thing although simplifies gear
Typically Attack Power or Spell Power, which mostly come from your primary stat. (Source)

would be nice for weapons to means as much to casters a physical.
Somewhat ironically, weapons are actually *more* important for some casters, than some melees. SP bonus is huge. (Source)

How many healers are hoping to get a great weapon early in WoD?  At the beginning of expansions, weapons and trinkets are always the slots that make the biggest difference for early healing when we are all sucking mana.