A thought occurred to me on swimming.

At this time many places are designed to be difficult to get out of the water if you were to jump in. most area's are surrounded by, essentially, cliffs.
If open world swimming is introduced, and I certainly hope that it is open world and not restricted to instances, then the ability to teleport and return while swimming is paramount.
The general animation for every race is a slight hover when teleporting/returning. I would assume the general animation for doing such while swimming would allow the player to hover over the water.

In addition to climbing, if ever introduced and knowing SE's interest to short-cut things, I would recommend an animation that shows your character grabbing to the ladder instead of the awkward warp you can see for example, an NPC getting up from the ground during cut-scenes.