First off, the concept video:
http://www.youtube.com/watch?v=uXUJFYkRIuI
The battery life says to have 390 standby hours, which I hope is true because the Galaxy s3's battery life doesn't last long and overall the phone seems to have some problems.
A lot of the details were released in Barcelona on February 24th
It will be released on April 11th 2014.
An interesting pinpoint is that not only will navy, black, and white models come out, but a brown model will too.
