The rumour is that Jet Vehicon will be Takara only. This is based on the Copyright stamp only not having a Hasbro stamp on it, as was with Breakdown.
As we now know, there is difficulty bring Breakdown to US market, so in a similar vein there could be issues bring Jet Vehicon to the non Japanese market.
This is just my own theory now, but I think part of the issue would be that the Jet Vehicon is slightly larger than Hasbro's standard deluxe but smaller than a Voyager, so wouldn't adequately fit in either price bracket and hence is impractical to sell over here.