With the proper talents, Mind Flay would refresh Shadow Word: Pain and Drain Life would refresh Corruption. This gives more utility to channeled spells, which normally require its full duration to run for optimum effect. PvP, in particular, requires constant motion which gimps the use of channeled spells. If the proposed changes push through, this means that channeled spells can be used for a short duration in order to refresh existing debuffs. This is an incredible trend that I hope makes it into live as well as extend into other, channeled abilities.