...The characters aren't necessarily exclusive, the only source we have for that is what one person on fbtb says (if there's another source, correct me).
Last year, we had three con exclusive figures, Superman, Green Lantern, and Batman. Two of these characters have already been released in regular sets (Superman exactly the same as in the promotion), and GL was featured as an Ultrabuild. The odds of these characters (particularly Venom) remaining exclusive to the promotions seem extremely low.
I suppose we'll have more information about that once the Super Heroes figures are displayed tomorrow, though...