George R.R. Martin's official site has been updated with a sample chapter from A Dance with Dragons (it's under the section marked SAMPLE). It's the first Tyrion Lannister chapter and confirms that this book is going to be exploring the Free Cities a bit more than the previous ones.
GRRM has also updated his Not-a-Blog section with news on the actual writing of the book. I was rather dismayed last month when he announced he was going to rip out the five Jon Snow chapters he had left over from the split to totally revamp them (more delay!). But apparently he finished them in a matter of days and now they are all the stronger. Then he went off to write some new Tyrion chapters (not the sample one, as that's been read out at conventions as long ago as 2003) and then do some stuff with the unnamed new POV set in
For those not up to date, the latest info is that the book will contain the following POVs:
Arya Stark
Bran Stark
Jon Snow
Daenerys Targaryen
Tyrion Lannister
Davos Seaworth
Asha Greyjoy
Theon Greyjoy
An as-yet unnamed new POV character
Possible recurring AFFC characters*
Yes, Arya and Asha will be in both AFFC and ADWD.
Theon wasn't exactly named, but GRRM did say that an "old POV will be returning", and since the old, abandoned POVs are Ned Stark (dead), Cat Stark (undead and never having a POV again according to GRRM) and Arys Oakheart (dead), that kind of leaves Theon as the only candidate.
The new POV's identity has not been revealed. However, there was a pretty big clue when GRRM said that the pre-split AFFC would have five chapters involving Dornish characters and only four appeared in the book, meaning that one has been moved into ADWD. Thus the likeliest candidate for the new POV is:
*GRRM has also said that if space allows, he may drop some AFFC characters in at the end of ADWD to keep the timelines of the two books in check. ADWD will likely take place over a longer time-period than AFFC. GRRM also acknowledged that four years or more might be too long to keep people in the dark about the fate of Cersei, Brienne etc. If he hasn't got room though, we'll just have to wait for Book 6 to find out their fates.
ADWD will cover largely a simultaneous amount of time with AFFC (but extending beyond it). So don't go jumping to any conclusions about Davos Seaworth's fate (as his chapters in ADWD could take place prior to reports of his demise in AFFC). This also means that Arya won't appear until halfway through the book or later (as her AFFC chapters would be taking place during the early part of the book).
No word on publication yet, but between these reports and what he's said previously, the book may already be 50% complete.
Finally, ADWD will have a new map, one showing the Free Cities.