This is from the Twitter account of Prince Al-Walid bin Talal: he says that he "took the oath of acclamation" (mubaya`ah) for "my father" Salman and "my father" Muqrin but then added "and I congratulated my brother Prince Muhammad bin Nayif". He did not use the word for mubaya`ah. Also, on the second page of Al-Hayat (today's issue), the mouthpiece of Prince Khalid bin Sultan, under the picture it says: "The servitor of the two holy sites, the crown prince and Muhammad bin Nayif". It did not in the caption use his title. Sunday, January 25, 2015
Signs of fissures in the ranks of 2nd generation Saudi princes
This is from the Twitter account of Prince Al-Walid bin Talal: he says that he "took the oath of acclamation" (mubaya`ah) for "my father" Salman and "my father" Muqrin but then added "and I congratulated my brother Prince Muhammad bin Nayif". He did not use the word for mubaya`ah. Also, on the second page of Al-Hayat (today's issue), the mouthpiece of Prince Khalid bin Sultan, under the picture it says: "The servitor of the two holy sites, the crown prince and Muhammad bin Nayif". It did not in the caption use his title. 
