RIP Teambuilder Chat
I'm not gonna miss teambuilder. I always found it really limiting and I look forward to the new champ select. (I'm in EU so still waiting...) But there's one thing I'm really gonna miss: the chat. Being stuck in a queue with a couple of strangers for 4-14 minutes waiting for a support surprisingly often led to some fun discussions and goofing around in a totally pressure free environment; lanes are chosen, champs are picked, there's no enemy team yet, no game to play, nothing to do except hang out and talk about tiny italian islands or whatever. Tons of times this atmosphere carried over into the game - we were already "friends" which meant we had a good time, whether we won or got stomped.
So, rip tb-chat. Hope some new function fills your shoes!