According to techview.me Samsung prepares a new kind of Galaxy S4. During the QnA session, Young Soo Kim (President Samsung Gulf) said that a ruggedized Samsung S4 which would be water proof and dust proof is in the works. We haven't confirmed anything yet, but it sounds cool. The Galaxy S4 water / dust proof isn't the only rumoured Galaxy S4 variant. Samsung even prepares the Galaxy S4 mini which has been delayed internal till June/July. According to Young Soo Kim (President Samsung Gulf) will Samsung announce the water / dust resistant Galaxy S4 in the coming weeks.
Accroding to our insider this is Project J Active.