Wow, divergence from the books is getting stronger and stronger. For the most part, I don't mind. The scenes with Arya and Tywin have been some of the most compelling scenes, so I thnk that has been a good change.
Littlefinger showing up will make the storyline easier to follow as they will skip the whole part about Edmure accidentally blowing up Robb's strategy and will just have Littlefinger broker the deal to bring Tywin and the Tyrell's together at King's Landing to defeat Stannis.
Dany's part I will reserve judgment on. Her story was a bit boring and needed to be livened up, plus I always wondered why no one just took her dragons, or at least tried, while she was so vulnerable. I think the warlocks stole them and this will just make the whole house of the undying scene be that much better once it happens. Plus they mentioned Ilryio (or whatever his name is) to remind viewers who the heck he is so that when he sends the boats to her, people will remember and understand who he was, so I think they are going to the same place.
The Jon Snow part worries me the most. He has to kill the Halfhand himself to be accepted by the Wildlings, I really hope they don't change that part and that they do it justice. I will be disappointed if they mess up that story line.