From the way it seems the LS7 motor may just become a standard Z-28 motor.. Past year or so I have heard rumors of a Engine design from Chevrolet that antiquates the LSX motors much like the gen 1 small block has become a relic. If I can find it I will post the CAD designs along with more pics.
Take note that I am posting pics, GM pulled the website already! These pictures and CADs should not have broken public yet.