It looks like the Ike housing is available for the 5DII now but....
They don't make a port for the Canon 16-35 II lens! I was ready to get a new housing and port for my 5DII but now I don't know what to do. I'm not interested in buying more lenses right now. The Ike web site says the 16-35II lens diameter is "too large to operate in port system".
Time to do more research.....
I'm also interested in this, as I have the 16-35mkII since before, and just got a 5dmkII. Seems silly to have to downgrade the zoom lens just for UW-photography (uses the mkII for landphotography a lot).
/Björn