There's no way we see any Episode VII product before Toy Fair, and even then I doubt we see anything juicy until SDCC. I'm assuming NYCC will only show us all of the filler we'll get between now and the Episode VII line release.
As for Sneak Preview figures, I don't recall any of them being too spoiler-ish. We got a major character for each movie (Windu, Jango, Grievous), an army builder (Clone, Wookiee), a minor character (Zam, Utapau guy), and an astromech, and the figures were pretty basic for the most part. I don't see why Hasbro wouldn't stick to the same formula.