Here's what little SG #65 from July 1993 had to say about the trade paperback:
Given Innovation's history, I'm sure no one is surprised it was postponed (especially given that Uncle Roger is pretty certain it never came out - chances are pretty good that it's yet something else that advance purchasers lost their money on - thankfully, I never ordered it). It will be a while before we actually get to SG #66 but I'll tease that I looked to see if it had any info as to why the trade paperback was postponed and the reason is quite interesting. But that's all I say for now...