Notice: This is all opinion. Non of this is cold, hard facts. These predictions are simply, well, predictions.
I've researched the price and info of this product heavily, and have read countless forum posts. These are my conclusions:
Price: I expect the price of this cube to be from $54.99 to $59.70 (The WR average, set using the cube). More than the UM for sure. Gan has never been really good at low prices. $20.00 used to be a ton for a 3x3, but now with magnetic cubes, new technologies, and premium serviced cubes, that is mid to high range for a 3x3.
Accesories: I expect a new GES nut or two, and maybe a few more extra papers and stuff, but that's about it. I am really hoping for new GES nuts, or (gasp) a new GES Nuts series!
Other Predictions: I think the 2017 Rubik's Brand 2x2 (Feliks' main), and the SM will come out simultaneously. Along with that, A Gan Air S (non-magnetic) will come out as well for those who dislike magnets.