If they are bringing out a new mustang I think it will be the Saleen that they already have but just not as "Barricade". It's logical and cheaper for them to make a street version since they already have the mold plus they could also release a new one with more interchangable body kit parts.
Anyways, whatever they bring out i'll be getting one of each just to add to my collection - lol. I really hope they release new trucks afterwards - they will likely do that for Xmas time since it would also be a hot gift item for sure!