'There's something about Kryptonians...'
New Gods' interest:
Justice League, the abduction of Superman and the attempt to subvert him and use him as the basis of a new army...
The Worldkiller programme:
Genetic and biological advantages
First hinted at in Superman issue 7 and not much development in issue 8.
I'm hoping this won't be a case of 'too many threads and not enough coordination...'