This one. I think it is Dunc & Egg. Released in October 2015
http://www.amazon.co.uk/gp/product/0...pf_rd_i=468294
Looks like it's just the first 3 short prequel stories of Dunk + Egg put together in one book and illustrated, just another money spinner
The Winds of Winter is a continuation of the story, not 100 years before. You can see a list of the already released chapters at http://awoiaf.westeros.org/index.php...inds_of_Winter
I love it... I'm on episode 6 series 4 watching it on Now TV.
It's fantastic! I'm only on series 2 but catching up fast.
I like the fact that no character seems safe so the plot isn't predictable.