I know they released extra tickets, when I was in the queue for June 15th, they announced about an hour before the doors opened at 4pm that there were tickets onsale at the box office. I didnt go and ask what type of tickets they had left, as I didnt want to leave the queue!
They seem to be releasing more tixs before the shows, I know there are extra tickets onsale at the moment for this weekend shows at London, and next week in Glasgow.