Samsung has started taking pre-orders for the Galaxy S8 and Galaxy S8+ in Korea today. You could order the regular 4GB models but also a Midnight Black Galaxy S8+ with 6GB of RAM and 128GB onboard storage for KRW 1,155,000 (957). People who pre-order the Galaxy S8+ 6GB/128GB will get a Samsung DeX station as a bonus. The Galaxy S8 costs KRW 935,000 (775) while the 4GB Galaxy S8+ costs KRW 990,000 (820). Deliveries of pre-ordered units should begin in 18 days. Source
Source: http://www.gsmarena.com/samsung_galaxy_s8_with_6gb_of_ram_on_preorder_in_korea-news-24434.php