It's still supposed to be a prototype, but according to TDI a civilian version is coming out "in 2008" (it looks like the current incarnation of the Kriss, using the Magpul-designed body)
[ref] so I guess it's pretty near production.
Amd I guess that makes an airsoft version not a huge surprise, since Magpul was involved (hopefully that also means the airsoft Masada is a bit closer, too).
Actually Magpul has some interesting design evolution pics on their site (including what the Kriss looked like originally, bottom right):
http://www.magpul.com/designgroup/kriss.html
And the Future Weapons episode with the Kriss:
YouTube - Future Weapons: The Kriss .45 Calibre Sub-Machine Gun