#1 - Sept. 3, 2014, 2:56 a.m.
Next build there will be a regular garrison NPC that allows you to enter the Proving Grounds, but for testing, the Beta instance teleporter (Nexus-Lord Donjon Rade) should offer direct transport to the Proving Grounds. Tuning is not final, but please give the system a try, and post your feedback in this thread. (Then go queue for a Heroic dungeon and post your feedback in the appropriate dungeon thread!)