The first Quest 5.0 Technical Preview version is now available.
This is a
very early release. Most importantly, it's limited to hand-coding games (there's no visual editor yet), and there's no support for games for earlier versions of Quest. These features will be added over the coming months/years (it's going to be quite a while even before the first proper beta versions).
You can download it from the new Quest 5.0 wiki at
http://quest5.netThe documentation on the wiki is both unfinished and out of date, so I would recommend looking at the sample files (see the separate download on the Downloads page) and the recent overview blog posts (of which there will be more shortly).
Any feedback, please post here or drop me an email.
Enjoy!