Certain works (Lulu, Salome and Bluebeard's Castle) will not be played before 9 pm (or after 9 pm, actually, but it's the principle of the thing). The cast of Hansel & Gretel* will be required to have CRB checks before appearing. (*This will be limited to the Overture, the dance duet, and the Dream Pantomime; the Hexenritt is not deemed suitable before the 9 pm watershed.)
Actually, I thought they were making the Proms interactive, with phone-ins and competitions. One example I heard of was a telephone poll to select the best piece to play during 4'33" (highlights of The Lark Ascending is front-runner); and a 'Last Night' Quiz with premium phone numbers (Which of these is traditionally part of the Last Night - a. Land of Hope and Glory; b. the First Night of the Proms; c. a sausage).