"Some of you have expressed interest in when Dominion will be available worldwide, and we wanted to respond to that directly. While we take a “when it’s ready” approach to our feature releases, you will be able to play Dominion in a nearly complete state at GamesCom (August 17-21) in Europe and at PAX Prime (August 26-28) in North America.
League of Legends: Dominion will make it into your daily play schedule shortly after PAX."
So "shortly" after PAX. I'd say in September. I do not know why people keep comparing it to Project Shiny and Magma Caverns. I mean it has been shown in videos and seems to be nearly complete. I am sure that it will be out as soon as they feel its worthy of playing. I mean as much as people on hear piss and moan about things being unbalanced and unfair I would imagine they would have some patience when waiting to ensure the new feature is more balanced. Also that is the entire reason MC was scrapped, it was too unbalanced. My point being if they released it tomorrow everyone would still complain about something, either being too unbalanced or taking too long to come out or whatever. I mean **** it is a free game, show some **** gratitude for Christ's sake.