Yes, there will be a new 3G Kindle with a front light.
The US State Dept Kindle contract specified 3G ebook readers. The contract is currently in limbo but it was very much alive when the upcoming Kindles were being designed.
Given that Kindles are sold worldwide and wifi is not ubiquitous *everywhere*, it follows that even a limited batch of 3G Kindles is needed for full market coverage.
They may get priced on the high side but they'll be offered.