This is one of the interesting points out of the interview recently.One of the social features under development is notifying you when friends join a queue and allowing you to queue with them
Hopefully at some point "friends" will also be guildies, because how many times have we had a small group queue after no one replies in guild, and then while in queue someone chimes up? So you have to drop queue and rejoin. In the future, the latecomer would just slide into the queue...
I like this.