There's been gameplay leaked of this I think right during a twitch stream (years ago!), an employee accidentally showed his monitor with the game in the background for like 9 seconds and he immediately switched it off. He got fired if I remember.

Am I misremembering?

https://www.youtube.com/watch?v=bleAL_Ovr74

I dug into this a bit and he did not get fired. And the thing being leaked was the existence of "NextGen" by the logo being shown, not the gameplay. NextGen was a different project, later cancelled.

https://www.reddit.com/r/runescape/comments/6av3sa/runescape...