This is the original Samsung Galaxy S4 keyboard now ported to the S3! The first port only for the upcoming Samsung based Roms with Android 4.3!
This is the updated Version, so it should work now for everyone!
S4 Keyboard: http://d-h.st/Ki3
S4 Keyboard and Launcher: http://d-h.st/xIO
If the keyboard is not working, install the "S4 Keyboard and Launcher" Mod.
Credits: Samsung for their great keyboard they forgot to add to the S3