A couple of months ago a Snapdragon 800 version of the Galaxy S4 Active appeared in benchmark scores but it has been keeping quiet since. Leaked docs that show diagrams of the phone break that silence and show a phone very much like the current one. It will have the same dimensions, same 5" 1080p LCD display with hardware buttons underneath, IP67 certification (water resistant and dust...
Source: http://www.gsmarena.com/diagrams_specs_of_the_galaxy_s4_active_with_snapdragon_800_leak-news-6922.php
