At least that's what it feels like in this interview snippet published at the AV Club when he was asked about the TV series catching up with his books. I love this because it sounds just like slightly panicked voice in my own head as deadlines loom.
GRR: I’m hopeful that I can not let them catch up with me. The season that’s about to debut covers the second half of the third book. The third book [A Storm of Swords] was so long that it had to be split into two. But there are two more books beyond that, and A Dance With Dragons. A Dance With Dragons is itself a book that’s as big as A Storm of Swords. So there’s potentially three more seasons there, between Feast and Dance, if they split into two the way the did [with Swords]. Now, Feast and Dance take place simultaneously. So you can’t do Feast and then Dance the way I did. You can combine them and do it chronologically. And it’s my hope that they’ll do it that way and then, long before they catch up with me, I’ll have published The Winds of Winter, which’ll give me another couple years. It might be tight on the last book, A Dream of Spring, as they juggernaut forward.