According to this fascinating article on Oreos:
The low-carb Oreo also didn't last, but that had more to do with a fad-driven marketplace than with science. When Kraft ditched the low-carb Oreo, it took the same cookie and put it in a new box touting a hotter diet trend.
And with that, the Oreo CarbWell last month became the Sugar Free SnackWell's Oreo.
It also details the history of the trans fat warnings and how Oreo has responded. Read the whole article.
(As an aside: I wish some other companies would bring back their low carb offerings as sugar free and give them wider distribution and a more sane price point -- specifically Heinz ketchup!)