Britain is currently considering legalizing engineered embryos as part of a scientific strategy to help eliminate debilitating genetic problems among future generations. The treatment could be written into law as early as 2013, making Britain the first country in the world to allow human trials.
This three-parent technique will involve mixing in healthy DNA from a third party who's not the biological mom or dad in the creation of an "engineered embryo." Although babies would inherit only a small fraction of their DNA from the third-party donor in such a process, it could save future generations from a host of genetic problems.
As of now, they are still investigating if the health benefits of such a strategy might outweigh ethical concerns. More details via The Telegraph.