Quick thing I'd like to address that I found really important:

"Wrobel: We had to identify some core components of PvE and PvP content in the game. In PvE we wanted to make a damage rotation that felt unique, while still being as effective as other classes."

This makes sense and is clearly a reasonable goal. However, from everything I've seen so far on PTS as well as those I've heard from, Magicka Warden DPS is quite low and ineffective compared to all other classes. Luckily we are dealing with a PTS so changes can be made, though I'd love for ZOS to please make sure this is the case. I want to main a Mag Warden DPS when Morrowind releases, but will not be able to give up my Mag Sorc if the DPS difference is so substantial.

Also, there is this:

"For example, we were playing with the idea of having Winter's Embrace exclusively deal damage, but when trying to make an entire class' Skill Lines, the other options made less sense for a tanking tree."

It makes sense why the decision was made to create a skill tree focusing on tanking. However, it may be worth looking back at this skill tree as a way to increase Mag Warden DPS should it continue to be on the low end. By upping the strength of Cold damage passively much more (perhaps through some sort of Cold Damage version "Burning Light" or increasing Cold Damage via the existing passive) it would be easy to bridge that gap. Just a thought