They clarified that the new refresh mechanic will be applied to all DoT classes.Originally Posted by Worshaka
Also, I'm quite sure that this mechanic will have limitations, like "Can only be refreshed shortly before it expires (3-5 secs)" or "Can not be refreshed to last more than x seconds". They will most certainly not allow you to recast VT or other DoTs to last the entire combat so you can spam MSK while you don't need to refresh anything. ^^