From what I've seen, they've kept really close & accurate to the book though there are sections cut out (for time sake, obviously). This isn't a spoiler alert per say but I will give fair warning for anyone who did NOT watch the preview of next week's episode. Don't highlight the white words if you don't want to know.
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I do think they'll kill off Khal Drogo because based on the preview, we saw Dani standing at what looked like a pyre and she set it on fire. Pyres are usually made to burn a body. *shrugs* That's my guess, anyway. I can't wait but then again, that means the season is over. Boo!
I have preordered the 5th book & can't wait for it to come out next month. I've read the first 3 books but I haven't started reading the 4th one yet. I'm saving it for my trip to Orlando next week. Woohoo!