I really like this addition. Most rogues might not have noticed, but our stealth mechanic is really strong! and there is no way to really counter it. As a rogue, you are nearly always sure to get a good opener against another target, which favors us in nearly all 1vs1 matches. I think it is okay, that DH gets a way to locate us, if they think it is needed. SS is still an ability, where you trade use of combat for x-ray vision, so it is not broken at all. What is going to happend is just, that you will see some more interesting war-games, where teams of players use a DH to locate people in houses. It will have no impact in Arena or Battleground, since it is really not a thing you can use in direct combat, so rogues are still gonna have good use of vanish in combat.