Probably because of these concerns, King ‘Abdullah last year took the unusual step of creating the post of Deputy Crown Prince, and naming Prince Muqrin, who is only 69 and a former head of General Intelligence, to the post. Muqrin presumably now becomes Crown Prince, unless Salman and the family make a change in ‘Abdullah's arrangements. [UPDATE: Salman has confirmed Muqrin as Crown Prince.]
It is axiomatic however, than those who speak about the inner workings of the House of Saud do not know, while those who know (the senior princes) do not speak. We'll see.