Black Desert Korean official site has teased the summer content update with a teaser trailer called "Amazing Adventures". Starting from June 15th, the KR version will get the new content gradually.
Most things have been talked about before, such as legendary unicorn mount Dine, gigantic ocean boss Bell, and Kamasilve Part 2. There are more but the trailer doesn't specific so we don't know if the "remastered graphics" will be implemented in 2017.
Below are some new screenshots of Kamasilve Part 2.