http://www.gameskinny.com/hzi5j/league-of-legends-team-siren-disbands-valuable-lessons-learned
I just found this link, sorry for the double post. This article explains what happened with some player insight from Team Siren.
I agree that an all female team would be interesting but I don't think it would be the best to bring in a team that started brining "empowered women" thinking into the game. There is no need for a march of -ism in LoL, I believe in equality and not feminism/masculism. There are ZERO reasons anything like this should be brought into League, because honestly everyone is treated fairly in the game.
Also, I get the wanting to be proud of being an all female team but naming your team "Team Siren" just sends the wrong message entirely. Sirens are untrustworthy, negative, evil. Why would you want to make yourself in the image of something like that? To sound sexy? Trying to sound sexy is just going to create more issues. I don't see Scarra, Voyboy, or Doublelift trying to be sexy!
Anyway there is my help/rant! I hope you get a team going you probably have what it takes to be honest the Pros don't look that skilled its how they operate as a team that wins them title!