GONE! Have Ferrari bagged F1's greatest designer?

Have Ferrari bagged F1's greatest engineer? Red Bull have announced that Adrian Newey is leaving their stable, with sources close to Newey citing his displeasure with the team's handling of Christian Horner's recent behaviour. With the prospect of one last chance to shape Formula 1, will he follow his head and join Aston Martin, or will he follow his heart and join Ferrari.