There are 2 flypasts - 19th May and 5th Jun. On the 19th May there is a large formation flying over Windsor Castle as outlined in the following CAA information -http://www.caa.co.uk/application.aspx?catid=14&pagetype=65&appid=7&mode=detail&ni d=2105
It looks like the events are opened with a Typhoon flypast then, an hour later, the biggie - lots of helicopters, BBMF, Tucanos in a '60' formation, Hercs, VC-10 + 2 Tornadoes, Hawks in an EIIR formation and finally the Reds.
On 5th Jun,all I have is the following - "Shortly after their arrival, The Queen, The Duke of Edinburgh, and other Members of The Royal Family will appear on the Balcony, at which point there will be an RAF Flypast and a Feu de Joie (“Fire of Joy” – a celebratory cascade of rifle fire given as a salute by The Queen’s Guard) from the Forecourt". Dunno what will be flying though.