I haven't enjoyed a Dr Who story as much as this one for a long time.
The theme of the series could be a timelord hybrid, with this story pointing towards a dalek/timelord race, but that could well be misdirection. It could well be a human-timelord hybrid, with in my opinion the doctor possibly...
I'm hoping those daleks were a collection of the best dalek military commanders from the entire dalek history.
A bit like getting together Alexander the Great, Napoleon, Saladin etc.