Heroics are still disabled for Gilneas realm.

After toggling heroic difficulty and attempting to zone in it says...

Heroic Difficulty requires you to be level 85. (Currently Disabled in Beta)

We're doublechecking to make sure the hotfix that unlocked the heroics was applied to each PTR. As a separate note, if you are not eligible to enter into a Heroic (ie You are less than level 85) then the error message will still say the instance is disable for beta. That incorrect error will be corrected in a future client build.