Replicate what? Motorola Atrix? Because that's exactly what Apple replicated. They tried to fool people into thinking that they did something more than the conventional fingerprint scanner but this experiment exposed their lies.
And FYI, there were reports in the news that Samsung was preparing fingerprint scanner too (people found some relevant APIs)
Except that the sensor in the Atrix didn't work very well. As for Samsung, they can say they're working on whatever they want to, but until we see it, Apple's ahead of them there. They acquired Authentic, so Samsung would have to use a different method not infringing on any patents they used.