Okay, this is going to sound crazy, but what if Hurt regenerated into Capaldi? When the glowing energy came up, I just assumed it was our fill-in for the transition to Eccleston, and something was happening to his face. In this .gif all you can see is a change to the eyebrows and eyes, but they are really not Eccleston's eyes at all, and look more like Capaldi to me- only slightly like him, but more him than Ecc.