Lady Stoneheart

Seriously, though, Peter Dinklage killed it in that speech.

Not only are they diving into A Dance With Dragons, they're even taking their sweet time on that one chapter. It'll be ... ahem ... interesting to see exactly how they drag out her Meereenese knot, as they'll no doubt must.

I just wonder how/when they're going to make Jorah Mormont become exposed as the spy to Dany, since it didn't happen at the same point it did in the book, aka before the actual conquest of Meereen.

In the books, Shae is a whore, she's clear about, she never lies about it, except when Tyrion, who is borderline abusive towards her, explicitely asks her to. She is a victim of horrible circumstances (being a whore in one of the most dangerous places to be a whore) but she tries to make the best of it by playing along. 
As a result, I never considered Shae's testimony to be a "betrayal", not anymore than Bronn refusing to fight for him. I simply saw it as a victim trying to use what little agency she had to better her situation. What was she supposed to do? Lie to protect Tyrion and die? Refuse to testify and probably die as well? With the information available to her at the time, testifying against Tyrion was her ultimate act of self-preservation.

Looks like Tywin is sending someone into Meereen to somehow get word to Dany that Jorah was spying on her. I'm guessing Barristan will hear about it and go straight to Dany. Nothing at all like book Tywin who basically dismissed the tales of dragons in the far east as fairytales that he didn't have time to hear whilst fighting a war. Now he's apparently going to be able to add sowing discord in Dany's court from thousands of miles away to his list of strategic ahievements before being killed on the shitter. Fine by me since Charles Dance is a fucking boss in the role.

I can imagine Shae was one of the most difficult characters to adapt for the TV show because so much of her story comes of seeing her through Tyrion's eyes - he allows himself to believe that she returns his feelings for her, and the narrative leaves much of Shae's motivation for staying with Tyrion ambiguous, riiiight up to the trial, at which point it becomes crystal clear that their relationship was very much employer/employee and any other investment that he had in it was Tyrion fooling himself. Tyrion is humiliated but it's entirely his own fault - and what's more, Tywin was right all along. So when he murders her, it's a dark moment because it's more to do with Tyrion's own self-loathing at this point than anything Shae's done wrong - it's just her job, after all.

But in the show there's no ambiguity to her. She's a whore, and she kinda sorta has feelings for Tyrion - she has enough scenes of her interacting with characters who aren't Tyrion, and in front of whom she has no motivation to pretend otherwise, that the fact that she has feelings for Tyrion is pretty clear. So you have to send her down this road of being jealous about Sansa and... I'm sorry, Shae is much, much smarter than that. Smart enough to know that anything Tyrion does is for her own good, smart enough to know that Sansa isn't a threat, and certainly smart enough to have known from the start that Tyrion was never going to make a lady out of her. Rings hollow.