It would appear in the most recent update that all DISPELS were changed. Now when a target is dispelled, thier spell still fizzle but they are not losing the pips cost to cast the spell used.
This means that dispels are 2 pip cost, school specfici Black Mantles, 100% Auto Fizzles against the target school.
I hope this was an oversight - the strenght of Dispels was that they would remove pips from the target. I know of quite a few minions that will be extremely dangerous if they don't lose their pips after being dispelled.
Not to mention that dispels can easily be removed with a 0-pip spell, which, in my mind, makes them more of a "Force Wasted Turn" spell (unless your opponent has a strong spell of a different school, in which case you're in trouble) - if they merely work as a 100% fizzle for a specific school, I believe people would be better off investing their training points in a stun spell.
I hope not either. We need the dispels to take away pips, especially in pve (as if briskbreeze and the warehouse wasn't clarity enough). So I hope this is just a bug and not a permanent feature, cause that would be a major inconvenience a well as a major pain in the butt.