MMO Champion is reporting that the latest build of the PTR includes a change to the PvP stat, Resilience, that will cause it to mitigate mana drains by the same percentage as it currently reduces the chance for critical strikes. This means that at maximum effective Resilience, mana drains will be mitigated by 25%. In conjunction with this change, the Warlock Mana Drain spell is increasing from a base of 200 damage every second to a base of 300 damage every second. Of course, one of the strengths of the Druid class is our protection against mana drains through shapeshifting into Bear Form and using Abolish Poison against Viper Sting. It remains to be seen how this change will play itself out.