Spell casting and spell channeling pushback has been changed to the following:
When casting a spell:
The first and second hit will add .5 secs each to the cast time.
All hits after the second will have no effect.
When channeling a spell:
The first and second hit reduces current duration by 25% of total duration each.
All hits after the second will have no effect.
Much much needed change now they'll actually have to use the interrupts. And if they kick/pummel/etc. the wrong school, we can cast through their melee hits.
When Rogues and Warriors start getting "auto-attack" pushback, this will matter. It's a nice change, but anything other than 100% pushback resist is just short changing casters. This also makes channeled spells much weaker.