I recently had someone ask me about the new trilogy I've just agreed to do. Now that I'd accepted the contract, would I tell her about it? Er, no.
I'm not being coy. I guess the plot--what happens in the book--is not so interesting to me as how it happens and the relationships between characters while it's happening and the funny things that happen along the way. And until I start writing the books, I don't know how all that will play out.