If you’re wondering how real those claims are, a recent trademark filing for the name “Smart AF” was made by Samsung. Its description mentions that this term will be used with “mobile phones; smartphones; tablet computers; auto-focus photographic cameras for mobile phones, smartphones.”
Considering that pretty much all smartphone rear-facing cameras come with autofocusing, it seems unlikely that Samsung is trademarking the name for a feature that has been present for years already, which has led some to believe that they could be talking about autofocusing for the front-facing camera instead.
However it is likely that Samsung could have improved the autofocus on the rear-facing camera enough to call it by a different name. After all Samsung did promise that we would be able to expect an improved camera, so could this be it? In any case take it with a grain of salt, but hopefully we’ll have more details to share in the near future.