What desktop systems are or will be supported?
See also: http://www.freedesktop.org/wiki/Desktops.
KDE : yes
Gnome : yes
XFCE : probably
GNUStep : ?
MacOS X : ?
What languages are or will be supported?
C : yes
C++ : ?
Java : ? (See also: http://jdic.dev.java.net/)