Mostly taken from http://us.battle.net/wow/en/forum/topic/4063167982
Question: What is "base mana regeneration"? How does mana regen work for casters (or mages)?
Answer: Healers get a significant amount of mana regeneration from Spirit, even during combat. Additionally, all mana users have a small amount of mana regeneration -- currently about 1% of maximum mana per second. With Invocation, that 1%/sec is removed. Things like Innervate will still allow you to regenerate mana, but you won’t passively regenerate any with Invocation.
Question: What is the range for Alter time concerning the "moves too far away" part?
Answer: 100 yards. It’s mostly just to indicate that it won’t reverse taking a portal to Dalaran or something.
Question: Is AM a proc?
Answer: Yes, Arcane Missiles is still activated via a proc from your other direct damage spells.
Question: Does Arcane Bomb have a target limit?
Answer: Currently, no. We’re hoping it won’t be needed.