Spent a lot of time today playing 5.4 arena then immediately playing 6.0 arena. Man what a difference. Looking forward to people's reaction.- Holinka (@holinka) February 7, 2014
Now, Holinka is definitely not saying that there categorically is an internal alpha. He is the PvP designer, after all, so it makes sense that he would have the ability to test his designs. But the big differences are things like the removal of abilities, the stat squish, CC removal, the rework of how health and damage scale -- all core systems. So while we can't take this as a confirmation of an internal alpha we can hold out hope that, if there isn't one yet, it won't be long. And that means that we could be well on the way to Beta.
It seems that, if the Warlords of Draenor pre-orders appear with the launch of patch 5.4.7, beta can't be too far behind. Given Blizzard's history, asking players to shell out for an expansion that isn't even in beta yet might be a tall order.