I realize I'm more down on GRRM's recent output than several people here, but I feel like his struggles were already evident in the markedly inferior quality of books 4 and 5 (YMMV), and my expectations for TWOW aren't high at all.
It's been 20 years since A Game of Thrones. He's a different person and writer today, naturally. He's the guy who mantains that he doesn't enjoy writing, but rather having written. I absolutely get that, because writing is an arduous process, but it's a tough combination when you're a slow writer to begin with, getting older, struggling with the material, and by the writer's own admission, more of a gardener than an architect when it comes to outlining his stories.
At any rate, pessimism aside, I'll hang around to see what becomes of it, of course.