We know the 890 Jump has a pool in it, and water elements are being added to various locations groundside. Have there been any water sound effects created, such as splashing of fountains or waterfalls, or a player jumping into the water?

Not yet, no. But we most likely will have to conduct a recording session for that, because you can get a library, but... So we don't have any recorded yet. We will record it as and when it's required, because in order to get the amount of flexibility and dexterity out of the assets, it's probably best to come up with a design doc and then record the assets, everything you need, because you can buy a sound effect library, but it might not have as much coverage as you need.