Season of Discovery Phase 4 PTR - Mage, Paladin, Rogue, Shaman, Warlock, & Warrior Changes

wowhead.com:

Blizzard has updated the Season of Discovery Phase 4 PTR Development Notes to include adjustments coming to the Mage, Paladin, Rogue, Shaman, Warlock, and Warrior classes later today.

This PTR cycle has been incredibly useful and we really appreciate all of the feedback we’ve received. While not all individual suggestions have been directly implemented, we’ve spent a ton of time reading your thoughts and it’s been a very helpful tool to allow us to focus on addressing some of the root causes of the feedback you are providing.

Thank you!

Mage

• Pyroblast now has no mana cost if cast using a Hot Streak proc.
• Brain Freeze now also makes Balefire Bolt instant and have no mana cost.
• The base damage of Frostfire Bolt has been reduced by 16%
  
  Developer’s Notes: We’ve seen extremely high performance from mages on the PTR and while we are comfortable with mages doing lots of damage, we wanted to tone down Frostfire Bolt slightly while making Hot Streak procs even more satisfying and also giving Balefire Bolt a better interaction with Brain Freeze.

• Malleable Protection now grants 4 Attack Power per excess point of defense when Holy
  Shield is used instead of Spell Power.
  
  Developer’s Notes: Many paladins have pointed out that they would like to see the
  additional benefit from defense when using Holy Shield to increase attack power rather than spell power and while we aren’t going in that direction for now, as a compromise, we are allowing Malleable Protection rune to essentially grant the same desired effect in addition to the baseline spell power benefit that Holy Shield grants from defense. This should make this rune more attractive to tanking paladins who it is designed