Sounds very ambitious. It would be nice if it were as sharp as the Nikon 14-24 and priced similarly, but I would very much doubt that.
Lens design is all about compromise; I would prefer to see a 14-24 that could use the existing Lee filter system for the Nikon version, perhaps adding an internal circular polariser?
For my needs, I would prefer a lighter (and cheaper) f/4 version -maybe even starting at 16mm (I rarley go that wide) with a smaller, filter friendly front element. To be honest, I'm probably talking about a different lens (a 17-40 replacement).