Thugs stole truckloads of smartphones, tablets and notebook computers valued at $6.3 million.
Samsung Electronics Co Ltd has replaced the head of its mobile design team, Chang Dong-hoon.
Samsung said it expected stronger earnings as a pickup in sales of high-end televisions and smartphones.
The company also vowed to invest in new technology and boost marketing.
The smartphone features a curved display and will be unveiled in October.
The Galaxy S IV model will heat up competition in the crucial US mobile phone market.