From the patch notes for 2.0. This sure is going to make <55 pvp queues fun. :/
I came on specifically to comment on that as well.
"•Players will now be separated into three level brackets for normal Warzone play: 10 – 29, 30 – 54, and level 55. Ranked Warzones now requires level 55."
With our low populations, this is going to hurt sub 55 pvp substantially. It's bad as it is already, this will make it much much worse.