Now, he called his dealer and confirmed this with his dealer. However, there is no official Mercedes-Benz statement on this so this is still considered a rumor. If, or when, it is confirmed, this will mark a huge shift for AMG.
BenzBoost reported last year that AMG would be moving to 4Matic for its vehicles so this is not out of the blue or unrealistic. A dual clutch all wheel drive E63 will be something special to behold with the M157 twin turbo V8. A German luxury sedan GTR so to speak and a game changer.
Thanks to @Even Money for the tip.