According to the Gamestop website, release dste is 10/5. When I preordered yesterday, they told me 10/5.
I, too, am interested in getting the poster and $10 off the Jack guide. From what the guy at Gamestop told me, the posters are really cool. I kind of laughed and said "Yeah, like the Skylanders posters a few months back." That Skylanders "poster" was an 8.5" X 11" flyer from a tear-off pad. The guy said that the Jack poster is actually really nice. It is full-size, textured and may possibly glow-in-the-dark.