The design of VisLua is being discussed on the VisLua dev mailing list. If you are interested in a cross platform IDE for Lua, including editor and debugger, then you should come join the list. Other details of the project can currently be found at http://lua-users.org/wiki/VisLua
The Lua Studio project has been hijacked! :-) This project is currently Win32 MFC, but plans are being made to engineer a cross platform IDE. Details can be found at: http://lua-users.org/wiki/VisLua More details to follow.