I made a post about this already as Djretwomanx said, you can find it here: http://eu.battle.net/wow/en/forum/topic/7860656533#1110/09/2013 02:54Posted by DjretwomanxDidn't a blue already post something about this topic. I think he said that they are aware that people will miss the feeling of naming a team and Blizzard is trying to keep it somehow in the game.
To sum up what was said:
We're aware that players have an attachment to having teams and an identifiable name to create a sense of comradeship and group achievement. We understand that this is something that will be lost with the new system and we're already looking into ways in which we can retain this feeling, however we have no news to share on this right now.