Harry Potter Fan Zone has posted that the premiere for Order of the Phoenix in London will be on Tuesday, July 3rd.  One of their readers spoke to an Odeon Leicester Square box office employee and they said that the premiere will be held July 3.

Now alll we are waiting for is the official confirmation from Warner Bros. So for now, treat it as a rumour

No word on the US premiere yet, but if WB announced the London Premiere I expect they will announce the US as well.

Thanks HP Fan Zone!