Update @ Bloomsbury
UK Potter publishers Bloomsbury have just announced their plans to post on their website video and still photos from the midnight Half-Blood Prince release party in Edinburgh.
PHOTOGRAPHS
Photographs of JK Rowling’s midnight reading inside Edinburgh Castle will be available at 9.00am on Saturday 16th July in this news section of Bloomsbury's Harry Potter site.
ELECTRONIC PRESS KIT
Bloomsbury’s EPK will also be made available in this section as a download.
This EPK (2 minutes) consists of:
1. JK Rowling arriving on the red carpet at Edinburgh Castle (1 minute).
2. JK Rowling reading from the Harry Potter and the Half-Blood Prince in the Great Hall at midnight to the audience of 70 children (1 minute).
There will be no media access inside Edinburgh Castle on publication night.
Harry Potter and the Half-Blood Prince by JK Rowling is published by Bloomsbury

It also reads on to say:
Before midnight on Friday evening, JK Rowling will arrive at the Esplanade outside Edinburgh Castle to be greeted by 2,000 Edinburgh schoolchildren and their families. Street performers, torch bearers, jugglers and entertainers will complete the carnival atmosphere outside the dramatic backdrop of Edinburgh Castle’s medieval façade. Onto the castle, will be projected a giant image of the Harry Potter and the Half-Blood Prince book jacket. ITV’s presenter, Stephen Mulhern will be hosting a live 30 minute programme entitled “HARRY POTTER AT THE CASTLE: MAGIC AT MIDNIGHT” (11.45pm-12.10am, Friday 15th July) which will be broadcast live onto a screen (9 metres wide x 7 metres high) on the Esplanade.
Immediately after midnight, at 00.01am on Saturday 16th July J K Rowling will read from Harry Potter and the Half-Blood Prince in the Great Hall of Edinburgh Castle. Her audience will be seventy children who will have travelled to the Edinburgh Castle Esplanade by horse-drawn carriages and have exclusive access inside Edinburgh Castle. These aspiring cub reporters (aged 8-16) have won media competitions to attend the Harry Potter Children’s Press Conference Weekend on behalf of selected English-language newspapers and broadcasters from around the world. The cub reporters will meet JK Rowling who will give them each a signed copy of Harry Potter and the Half-Blood Prince. They will then have the weekend to read the book before attending the Children’s Press Conference on Sunday 17th July to question J K Rowling in person. ITV’s ultimate Harry Potter fan, Owen Jones, 14 (from Cardiff) will also have the exclusive UK interview with JK Rowling which will be broadcast on a 30-minute ITV programme entitled: “HARRY POTTER AT THE CASTLE: THE J K ROWLING INTERVIEW” at 5.30pm, Sunday 17th July.

So be sure to check out their site HERE on the morning of the 16th.