Well I will divulge something here...I still find it odd that three writers were announced to write Bond 23. What's Peter Morgan bringing to the table that Purvis and Wade are not able to?
While I think that Morgan will certainly do much more than a polish of P&W's work on the script, I do think that his involvement was brought about because of the success that EON has had with outside writers teaming up with P&W on the last two scripts. Although I'm not a fan of all of the things that Haggis added and deleted from the Casino Royale script, his involvement did help bring instant credibility to the project. Since he's no longer on board, they've turned to Peter Morgan to help P&W craft a good storyline and a good script. More simply, he's there because he's a critically acclaimed screenwriter, and it definitely is a good thing to have someone of that quality working on the script.
I'm curious if he was brought on for more than just that he tend to write politcal drama and one of Quantum's operatives is one of the prime ministers closest advisors.
Peter Morgan is co-writing a Bond film where the villain is a 1960's Governmental lawyer struggling with his conscience who starts to manage a Northern football team before reluctantly becoming Henry VIII's doomed lover. THAT is why Peter Morgan came on board.
Now that you mention it it's pretty clear. Strange it wasn't realised earlier...

