I think it is highly likely this will be the retheme of splash canyon. The fact the work has been taking place and its has been heavily rumoured that Cornish/seaside theming that exists with Stormforce 10 and maelstrom was going to extended to cover the rest of that area. The teaser matches with these rumours. It will be interesting to see how they will theme it into this theme so its not too similar to the storm force 10 theme. It could also include the new Wave Swinger which is also expected in that area. There is talk of a Disco coaster coming at some point as well, I expect they will add this for 2022 and would be fairly easy to theme that to fit into the theme.