I haven't read it yet. So far I've only checked a few things which I though were mistakes in the hardcover to see whether they were fixed, and they were. For example in the conversation between Mat and Moiraine after they got out of ToG now there's a mention that Morgase is not really dead. The mention that "Egwene wanted Cairhien..." in Chapter 45 is now changed to "Elayne wanted Cairhien...", which is quite funny, given that this line was the reason for a Egwene bashing thread here.