#1 - 2014/01/25 01:59:00 AMI downloaded what was supposed to be the PTR client setup file. Instead, it only does an update check followed by bringing up the Live launcher. Opening up WoW to double-check things, I did not see the PTR icon in the corner nor was there any "WOW1" or "WOW2" option.
Going through the whole process again -- Account > Public Test Realm > Download Game Client > Run file -- resulted in the same outcome. I asked around, and others told me they came to the same conclusion: It's been removed.