Heard on the 25th also, booked my interview slot for late August. But, the first time I checked (soon after I received the good news!) the first interview slot was on the first few days of August - something like the 3rd. Cant remember exactly. When I actually booked the interview, the next day, virtually the whole of August was gone, only leaving September. Not sure what the situation is now though.
Cheers,
BB