Time FrameOctober 2016
This rumor now appears to be dead.
A new themed bar was rumored to be coming to the Tower of Terror exit area. The bar was reportedly being built across from the PhotoPass area.
The assumption was the bar would located behind the "Unused Desk" area on the construction drawing above.
June 2, 2016: WDWNT.com is reporting that the themed bar at the exit of Tower of Terror has been cancelled.
April 15, 2016: On Episode 101 of the Unofficial Guide's Disney Dish Podcast, Jim Hill reported that the rumored bar inside of Tower of Terror seems to be done as a replacement to the Guardians of the Galaxy overlay. Jim also mentioned an expected opening date of October.
April 12, 2016: WDWNT.com is reporting that a new themed bar will be built at the exit of Tower of Terror. The bar will be located across from the PhotoPass area.