First I want to say that's not my choice who comes in the Sylex4 beta team, XeXeS has choosen two (this was before PHeMox answered, so I'll ask him for you). The happy two are:

-ello
-gri

For the others:
Perhaps you want to join my beta testing team for the SceneEditor, then you'll be able to test Slx4 too, but a little bit later?

Regards
Kohji

Your friendly mod is at your service.