CAD OC'er said:Looky what I found:
http://www.extremeprometeia.com/acatalog/Extreme_WaterCooled.html
this is an example of a retail G4, I think..
No, that's just a guy who bought a number of G4's a while back (~6 months ago) and is building and selling custom systems with them installed.
The Storm/G4's will be available much like any other waterblock you can get.