The NDA on this was just dropped on this info, and we wanted to get it out to you ASAP.
Christie Golden, author of the hit novel Arthas, will be writing the Cataclysm novel. There is no additional information on this, other that its existance. One thing can be sure about though, it will no doubt contain a ton of great lore and be very well written.
We'll have our interview with Christie up for you later this evening or early tomorrow.