I was surprised that there is so much confusion on this issue, but upon searching 3-24 I only found one passing reference to Information Superiority, and it was in Appendix E. However, in the old FMI 3-07.22, I found this, which sums it up pretty well, in my opinion:

The goal of IO is to gain and maintain information superiority at decisive points. Information superiority is the operational advantage derived from the ability to collect, process, and disseminate an uninterrupted flow of information while exploiting or denying an adversary's ability to do the same (FM 3-0).
I think that much of the discussion on this thread is borne of misperceptions of IO rather than of some defect in the concept of conducting operations in the information environment. The real issue is how we organize our staffs and how we task various assets to accomplish it.