He answered some questions submitted by fans, and they can be found here:
ew.com/martin
Here's the first question. I'm on the side of the submitter here. GRRM seems (in his blog at least, and in the post regarding ADWD on his website) to be too busy doing things other than writing ADWD. It's great that his success has generated offers for him (graphic novels, etc.), but his real bread and butter comes from ASoIaF, and that's where 90% of his attention should be.
I understand that you have a life outside of Ice and Fire, but I feel like you're just being cavalier toward your fans, who've been patiently waiting for you to finish [A Dance with Dragons]. Why do you feel like you can blow off your fans like this? — Bridget
GEORGE R.R. MARTIN: I've tried many different replies [to these types of questions]. I've tried putting updates on my site, or addressing these things in my live journal. But nothing seems to satisfy some people. Or, you satisfy Bill, but then Fred is angry at the tone of your reply to Bill, or something like that. I certainly don't think I'm being cavalier to my fans. I think I go above and beyond the call of duty in terms of staying in contact. What they want is the fifth book of Ice and Fire, and my editors and publishers also want that, I want that. And I'm writing it! What am I supposed to do, send it off unfinished, or bad? I'm working on it as hard as I can. Writing it tough sometimes, and it doesn't always go as fast as you want it to. [Sighs] One thing I've learned is to stop trying to predict when it's going to be done.