since I haven't found any updates on this topic on mmo-champion, I want to give a brief translation of this post:
According to the post, this "feature" is only active on EU, nothing mentioned about NA realms.Blizzard made it possible so that everyone can queue with anyone else from the same language speaking realms, ignoring the realm pools. This was demanded due to the connected realms affecting realm pool changes so that some realms had very long waiting queues.
Small "language pools" queue with english speaking realms.
Hope this helps finding groups, although new content would be better