Brandon has talked to Michael Whelan about a landscape cover poster. He has his own print store and they are not cheap. We'll have to see what happens. (Oh, and you know how Brandon bought the original art for the WARBREAKER cover from Dan Dos Santos? The original art for THE WAY OF KINGS is so much more expensive than that that Brandon probably won't buy it...unless the book hits #1 on the NYT and his bonuses kick in; then he might have enough...)
There will be poster versions of the endpage art that so far none of you have seen. Isaac designed them as posters from the start. Also, Inkthinker's sketchbook art is a high enough resolution to do something with. At the moment I can't remember what rights we bought regarding that.
If you're coming to Dragon*Con, there will be an Art of THE WAY OF KINGS panel on Monday featuring Inkthinker and Isaac, as well as Brandon and Tor's art director Irene Gallo. I'll be there too. [EDIT: Oh, I see you said that already.]