[spoiler]Brienne's only finished if they write out LSH entirely, which I can't imagine they would.
I read recently someone supposed the next two books could be done in one TV season because they are so light on action, and then push to their own finish.[/spoiler]
[spoiler]It makes a fait bit of sense to have LSH shifted to the next series. That part of the story is very sparse, slow, and disjointed in the books - Brienne gets very little 'screen' time and LSH gets basically none except for the revel when she has Frey hanged, and then when she meets Brienne later on. And other than a few references when she's being talked about by other characters rather than being actually on scene herself, that is ALL, even as of the end of book 5. There's really not very much to hang your hat on there - I expect they'll have to invent some more material just to flesh the plotline out a bit when the show does bring her in.
GRRM really dropped the ball when it comes to pacing, on book 4 especially. 5th was better, but still dragged quite badly in places. Hope he gets his **** together for the next one. [/spoiler]
[spoiler]It's kind of exciting because the show can go whatever way they like.
Bran's storyline is already 2 books ahead, Theon is about 1.5 books ahead, and people are going to be ■■■■■■ if there's no Arya, Tyrion and Khaleesi/Dragons for a whole season so it wouldn't hurt to merge the 2 books, though I would still prefer it done over 2 seasons.
Basically there's the Greyjoy's, and I wouldn't have a problem if they sped that up.
Then there's Dorne, which should add some new colour to the show.
There's Brienne and Pod, as well as Jaime wandering about putting out brush fires.
A fair bit of politics and what not going on at the Wall.
Winterfell and the Boltons, & Co, fake weddings and imposters.
Cersei & the church.
So there's a fair bit to get through, especially as arya's scenes would all be long ones. I guess she might only have to be in every 2nd show.
It would be interesting if they took new directions with a lot of the characters. I know they got approval from HBO to start on 2 more seasons, so I guess it would make sense to film them (or some storylines) concurrently.