The Harrowing..... New map?

The cinematic for the Hexakill made it sound like they were going to come out with a new map that played with the players mind. Like the setting they had for the mode with Coop vs. A.i. and the A.i. were over powered. I forgot what that mode was called.

The idea I had was that in PvP the map would be kind of dim with shadows looming over the lanes and after 5 or 7 minutes have past they should have Ghost Champions of the enemy/ally team come out of bushes to freak out the ally/enemy team giving them a choice to either attack it or run but one hit on that 'Ghost Champion' it turns into that ghost from the cinematic, disappears, and puts Fear on them but would kind of suck if that were to happen in a team fight. It's just an idea I had that just popped into my head. What do you guys think? Terrible idea?