The new S4 Mini packs a number of top end features in a diminutive package, with things like S Translate, Group Play and an upgraded camera system. However, it does away with a lot of the "innnovation" we saw in the S4 - so Smart Scrol
In terms of hardware it's as expected: a Super AMOLED qHD (960 x 540) 4.3-inch screen sits on top of a polycarbonate phone (coming in White Frost and Black Mist... or white and black) with dimensions of 124.6 x 61.3 x 8.94mm. It's going to be super light too, with a weight of just 107g.
It packs a 1,900mAh user-replaceable battery
On the connectivity side there are three options – the top of the line model with LTE connectivity (and NFC), a 3G HSPA+ model and a dual-SIM 3G model. There's also dual-band Wi-Fi a/b/g/n, Bluetooth 4.0 and GPS + GLONASS.
http://www.techradar.com/news/phone-and-communications/mobile-phones/samsung-galaxy-s4-mini-officially-unveiled-1155278