This would be a feature to make knowing what spawns to expect in the world as understandable as scents.
I imagine it would work as another tab in creature tracker. It would tell you what Zone you're currently in and some meaningful data on the types of spawns to expect and how often. Perhaps a number like 100% chance with 1,000 spawns or something. This way when people say they haven't seen a particular creature they'll have more data than to say "it hasn't been spawning". They can drive to the right zone, and hang out and give better feedback for the accusations of no spawns happening.
This would also help me decide if I want to use an omega scent now, or wait to see if I'll get different omega spawns.