Not much has changed from S4 in terms of design though, which is a disappointment. And it still looks like it's made out of some type of plastic and not even faux leather!
The UI is a little bit different and is much flatter.
The camera is 16MP. It is yet to be seen if it's the ISOCELL tech. Also, UHD recording is present.
According to calculations done by somebody, the battery is 2800 MAh, and it looks just the same as the one on the Galaxy Round.
There is also a Fingerprint scanner on-board, possibly only a Swipe type which is located on the home button.
Menu key has been replaced with multitask key and there is a weird sensor near the camera flash
Check these out:
COMPARISON WITH S4:
FINGERPRINT SCANNER APP:
Here are some Vines: https://vine.co/v/MmIKp0w1Alm - BLUE VERSION
https://vine.co/v/MmIZdL2Jn3j - Lock screen animation
*These pictures were not taken by me.