#5 - April 5, 2016, 5:58 p.m.
Battlegrounds simply require a lot of people to have queues pop consistently. Your average battleground requires 10-15 players on each faction and lasts 15 minutes. A skirmish requires 2-3 players from either faction and generally last 1-3 minutes.
When we transition to beta, we will be disabling skirmishes for a short time to focus our numbers on battlegrounds. We'll then re-enable arenas a few weeks later. But sorry, I can't share when that will be.