I wouldn't be surprised if Samsung excluded it from the production release (I'm assuming it's just a software program) due to timing issues...and Mobeam is keeping quiet so it can still receive relevance and visibility.
During the SGS4 announcement Samsung also said there would be a feature where screen unlocks could be disabled if you automatically connect to a specified Wi-Fi hotspot (like your home router). I haven't been able to find that, and other forums said that also wasn't included in the final production release software.