More recent renderings, linked to the Han River Renaissance Plan, show the planned ferry terminal...
...or feature more... unique designs:
Here's the most recent design:
The Chosun Ilbo reported on the release of the latest plans not long after Samsung C&T pulled out of the project.
A giant underground strip mall six times larger than COEX will be built in the planned international business district in Yongsan, Seoul. Dream Hub, a project financing vehicle for the development project, in an investor blitz on Thursday unveiled the new master plan. [...]Three landmark buildings will stand in the center, and will be 100, 72 and 69 stories tall.
Dream Hub said the total area for business facilities in the district will be 1.428 million sq. m and accommodate some 70,000 workers. Residential space will take up 26.6 percent with some 5,000 apartments for existing residents of the area and low-income earners as well as luxury clients.
Here are views of the plan from the ground:
And here are views of the interior of COEX x6:
Of course, one wonders whether the area really needs so much retail space, especially since the I'Park mall at Yongsan station is nearby. On the other hand, since most of Yongsan-gu is scheduled to be torn down at some point, perhaps there will be enough residents nearby to support the businesses.