According to the London 2012 Olympic, Feb 27, 2012, The Opening Ceremony of the Paralympic Games(August 29th, 2012) the London Organising Committee of the Olympic and Paralympic Games (LOCOG) has confirmed that Her Majesty The Queen, accompanied by His Royal Highness The Duke of Edinburgh.

Paralympic Games will be held August 29 to September 9th, 2012 in London.

Her Majesty The Queen, Elizabeth With the role of The Queen in the Opening Ceremony of the Olympic Games declared in fron of the 204 nations participated  
in 2012 London Summer Olympic with the glorious successful 2012 olympic in London and officially opened ceremony on July 27, 2012   by Queen Elizabeth II which closed ceremony on August 12, 2012, Athlete's Oath by Sarah Stevenson, Judge's Oath was done by Mik Basi, Coach's Oath was done by Eric Farrell, and Olympic Torches were done by: Callum airlie, Jordan Duckitt, Desiree Henry, Kalie Kirk, Cameron MacRitchie, Aidan Reynolds, Adelie Tracey, Austin Playfoot, and  relighted which  Cauldron moved into position in Olympic Stadium". London 2012 Olympic and Paralympic Organizing Committee on 30 July 2012.

2012 London Summer Olympic spirit didn't stop with  the First Lady Michelle Obama and members of Team USA past and present, as they joined military kids and 2,000 American military children and American and British students at Let’s Move! London, an event held to spread the spirit of the Olympic Games in London. see the spirit with the 2012 London Summer Olympic via photos in below:

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Finally, a long waited Paralympic opening ceremony will be declared by The Queen, Elizabeth on August 29, 2012 which The Queen, accompanied by The Duke of Edinburgh, also will be openining  the Paralympic Game same as the 2012 London Olympic Opening Ceremony on July 27, 2012.  As Head of State, The Queen will proclaim the Paralympic Games open by saying: ‘I declare open the London 2012 Paralympic Games’.(Source London 2012 Olympic game)

2012 Summer Paralympic Games will be the fourteenth Paralympics and will take place between 29 August and 9 September, as governed by the International Paralympic Committee. They will be held in London, United Kingdom, after the city was successful with its bid for the 2012 Summer Olympics. It is the second largest multi-sport event ever held within the United Kingdom after the 2012 Summer Olympics.

The Games are expected to be the largest and most commercially successful Paralympics ever: Great Britain's success during the recent Summer Olympics and growing interest in Paralympic sport worldwide contributed to a significantly higher demand for tickets to the Games than in previous years, breaking numerous sales records. They will also mark the return of the Paralympic movement to its birthplace; the British village of Stoke Mandeville first hosted the Stoke Mandeville Games, an athletics event for British World War II veterans, to coincide with the opening of the 1948 Summer Olympics in London. The Stoke Mandeville Games were the first ever organized sporting event for the disabled, and served as a precursor to the modern Paralympic Games.

Meanwhile, From United States, Presidential Obama delegated White House officials to London, United Kingdom to attend the Opening Ceremony of the Paralympic Games on August 29, 2012  U.S. Army General Martin E. Dempsey, 18th Chairman of the Joint Chiefs of Staff,  will lead the delegation which The members of the Presidential Delegation are including

Honorable Louis B. Susman,
Ambassador of the United States to the United Kingdom of Great Britain and Northern Ireland.  
The Honorable Lisa P. Jackson,
Administrator, Environmental Protection Agency,
Mr. Kareem A. Dale, Special Assistant to the President for Disability Policy, The White House,
Ms. Jean Driscoll, U.S. two-time Olympic silver medalist, five-time Paralympic gold medalist, three-time
Paralympic silver medalist, and four-time Paralympic bronze medalist,
Ms. Sharon Hedrick, U.S. two-time Olympic gold medalist, six-time Paralympic gold medalist, four-time Paralympic silver medalist, and two-time Paralympic bronze medalist and
Mr. Larry T. Hughes, U.S. Paralympic gold medalist.

The Games will officially be opened by Her Majesty Queen Elizabeth II for the 2012 London Paralympic Opening Ceremony on August 29th, 2012.