In the book series A Song of Ice and Fire, A Dance of Dragons is Book 5. The HBO series just started with book 1, and this 5th book took six years to finish. It will be published in both the USA and UK on 12 July 2011. The plan is to release the ebook and print editions simultaneously.
The HBO series was great! Can’t wait for Game of Thrones season 2 next year, July 2012! They have already begun casting for the actors and actresses who will play the GOT Characters!