devtrackers.gg
The last time this stuff was posted one of the mods said that this was from a cancelled project, so either the unannounced mmo was cancelled, whatever project this stuff was originally from was cancelled and got moved into RS Next/aurora/next gen, or this and the unannounced mmo are separate projects, with this being cancelled and the mmo still in production.
I really hope that either the jmod who said it was cancelled was mistaken or that the work is still going to be used in some form because this stuff looks amazing.