I was upset when DT went but it plodded on too long he should of died straight after like CE who in my opinion ha the best regeneration scene ever.
Still was a very good episode and yeah I thought it was probably his Mom. Also if you watch one scene carefully you'll also see the blink statues have a connection to the time lords..
For what it's worth dhampy the main writer Russel T Davies is no longer writing for Dr Who.