Hardware wise, the Galaxy S4 packs a 5-inch Full HD Super AMOLED 441ppi display underneath Gorilla Glass 3, dual cameras (13MP rear and 2MP front), 16/32/64 GB of user memory, a microSD slot for up to 64GB more, 2GB RAM, an accelerometer, gyroscope, temperature and humidly detector, a 1.9 GHz Quad-Core processor or 1.6 GHz Octa-Core processor, and more. Definitely a lot of bells and whistles packed into its 130g frame.
The key features of the phone are things like the dual camera function, where both cameras can take pictures at the same time; the S Translator, which provides instant translation of both text and voice; Samsung Smart Pause, which will automatically pause a video if you look away; and the S Health software, which monitors your health using a variety of built-in sensors. Contrary to early rumors, the physical home button is still there. Indeed, the S4 doesn't look all that different from the S3.
It's not exactly a revolution, but a respectable evolution. The GALAXY S 4 will be available starting in Q2 in 155 countries on 327 mobile operators. Check out the full press release below.