I believe that Straker actually just told Freeman that in his dream, he "killed" Trask, but not how (I just reread that part).
So interesting how the plot is complicated further with Straker's group also being a bit afraid of Superman's powers going out of control.
So it probably will be in here soon, that Wayne Irig finds the kryptonite in Smallville and then Trask gets some... Hmmm...
Looking forward to more soon.