I'm sure there's information - but I don't know if there's information *in English* anywhere.

I liked that we never saw Mycroft's face - made him a ton creepier. And this Mycroft is cree-py! His relationship with Sherlock practically makes Mark Gatiss' depiction look like a big cuddly teddy bear.

I also find this Holmes interesting. Unlike canonical Holmes and the modern adaptations, he obviously hasn't shut down all emotion in favor of deduction. He's a bundle of emotion, he's travelled, and he very obviously tried to have a standard emotional relationship with Irene - which she equally obviously ruined not by outwitting him but by breaking his heart with betrayal.