All that information was accurate at the time. Stories grow, and sometimes more quickly than dragons.
The series will be six books. A STORM OF SWORDS will be next, then A DANCE WITH DRAGONS, then THE WINDS OF WINTER. I am not completely decided on the title of the last volume yet. My contract says A TIME FOR WOLVES, but I am not completely happy with that and will probably change it if I come up with something I like better.