It is actually the books that were more out of sequence chronologically. We'll probably just get more detail for Petyr's Vale scheming than the overview we got in the books.
We'll definitely get a few more stretch goals at least. When the treasure chest comes out a whole lot of money is going to be dropped on Compendium Points... if the items are shiny enough.
Arya didn't have her best quote from the books. Sigh.
Yeah I've been reading the books for about 12 years or so now.
Oh and Robert Jordan died before finishing the Wheel of Time novels, and he took better care of himself than GRRM. Luckily he'd left copious notes for it to be completed.