It is quite obvious between last weeks episode and this, The Doctor still cares for Clara. He is, after all, still the same Doctor just in a different skin. I quite like him, this attitude of sarcasm. He is a conglomerate of all that went before, so obviously bits and bobs of his previous personalities reappear.
Anyway, I do not know if he can choose his appearances when regenerating, or if it is random.
Clara seemed very taken with his last appearance as the 11th Doctor (Matt Smith), but seems disinterested in his present appearance and has quite easily moved on to Dan Pink.
In this last episode, you could see how pleased the present Doctor was when he assumed Clara's 'boyfriend' was the one wearing a bow tie and resembling his previous self. He has shown jealousy.
I think it shows shallowness in Clara. She even admitted to Pink that she liked the excitement of being the Doctor's companion (though she would not say her relationship with him.) So, is she now just using him? The Doctor? She isn't interested in him now that he appears old?
I think she is fickle, self absorbed, self centered and conceited.
If she had truly cared about the Doctor, her feelings wouldn't have changed.
In my opinion, anyways.
It disappoints me.