Jagex's next unreleased MMO, Stellar Dawn (previously named Mechscape) is scheduled for release sometime soon according to their official website, http://www.stellardawn.com/
. Their website shows a few images, which are all artwork and there are no actual gameplay videos posted.
A few months ago a leaked trailer was found and uploaded to a Chinese media sharing website called YouKu where it is safe from Jagex copyright claims. You can watch their trailer at this link: http://v.youku.com/v_show/id_XMTQzMzgzMzI0.html
The YouKu website may be blocked by your ISP or not load properly for you. I am attempting to download the video and give a public download link at this moment. EDIT: Nevermind video hosting websites reject the clip because it's copyrighted.
In all honesty judging by the trailer this looks really fun. It's definitely made by Jagex if you look at the models, maps, ect. I just want to spread awareness of whats coming soon!