Kalgan, I greatly appreciate your input so far. I would like to thank you for the opportunity to help mages feel a little more at ease with the expansion, and also the continued dialogue regarding the upcoming changes.
I hope you will take a few moments, and read this and reply. These are things I hear repeatedly in and out of game from other mages.

Ok, we get it, you don't want us poofing invisible and going straight back to DPSing with a now empty threat meter to be able to HEAVILY burst <Trinket, AP, PI, and w/e else we can come up with>

The major concerns I am hearing from mages regarding the fade involve 2 major issues.
1. The fade time is going to be able to be broken by damage... so we are going to use an ability with a 5 minute Cooldown for a maybe 50/50 chance to get an aggro dump due to AoE effects, stealing aggro, and DoTs... I understand the concern with us hitting invis and you wanting us to stop DEALING damage during a slightly extended period for the cost, however, I really feel, if you are serious about this being an aggro dump, with a 5 minute cooldown, it is not unreasonable for this fade to be uninterruptible by outside forces once initiated ... we dish out damage it stops it. This would alleviate the majority of PVE concerns twith the spell that don't directly involve " I am gonna fall off the top of the damage meter if I have to wait"

2. What qualifies as a breaking the fade spell? Mainly concerned with things like, can I hit Ice block after invis and drop my aggro once I pulled it? Can I Evo while fading? Bandage? use potions? Eat? Drink? Smoke Pot <just kidding>

You want us to have invisibility back, but on a SHORT leash... May I propose a compromise? Make it a 4-8 second cast that only uses the cooldown if the spell is successfully cast, like the old Pyroblast.
I know, this makes it possible to use in conjunction with POM, but if you use POM on your threat reduction, you can't use it to push your burst damage up. It guarantees the spell is effective when we waste a cooldown. 5 minutes is a LONG time, why make it an ability that has a minimal chance to be effective?

In regards to Arcane Tree, many people are bringing up Arcane needing Range and Crit boosts, so I will leave that alone for this thread.

Prismatic Cloak on the other hand is a little off the mage design from what I have seen. We are cloth wearers, masters of elements, Arcane Energies, but we take it hard when someone actually accomplishes touching us. I would like to offer a new possibility.

Have the prismatic cloak be more like a displacement form of Mirror Image. The talent grants an arcane mage a 1/2/3/4/5 % chance of displacing away from any attack. This follows very well with the idea of a mage, that we are to avoid damage, not mitigate it. It is not really overpowered at such a low percentage, and works essentially like a dodge. If you feel this would be overpowered, you could even put a small mana cost on the displacement, like 5% of your base mana, to compensate for the teleport used to achieve the damage being completely dodged. Arcane is the magic used to move entire planets, to alter the rules of reality and shape it to our will. This would fit in line with that tree, and give Arcane a truly defining upper tier ability.

Thank you very much in advance for your thoughts on this, and your quick reply.

Oh yeah, one more tidbit of relevant info. Invis will slowly reduce your threat level as you fade into invisbility, so if it is broken early you'll almost certainly have gotten something out of it (you'll see the update in the tooltip sometime in the nearish future).

Bear in mind that the aggro management aspect of invis is intended to be used proactively, so don't expect it act quickly enough to get you out of a jam when the raid boss has already decided to come running for your head.