It happens quite often freelance enthusiasts to port software goodies, such as launchers and other exclusivities from newly-released smartphones to the other devices. The Samsung Galaxy S4, as one of the hottest devices right now, got its launcher ported to all devices running Android Jellybean.
The hard work was done by XDA Senior Member emwno. The launcher, as well as the weather widget, are compatible with the most popular screen densities: XXHDPI, XHDPI, HDPI and MDPI. The port was tested across many devices and has been proved to work quite well, save for some minor bugs that are always present in such ports.
If you are willing to give your device a breath of the Galaxy S4, feel free to try the launcher, which can be downloaded from the official thread on XDA-Developers forum.