Just going by memory from last year of potential returning talent:
1st/2nd Waukee & Linn Mar = Depth vs Top end talent.
3rd up for grabs = Johnston, CR Kennedy, IC West, Cedar Falls
Never count out Valley based on population.
I might be forgetting someone.
Things happen from season to season though; Injury, move-outs, move-ins, good athletes joining in that haven't been there before, etc.... It's a matter of recruiting & cultivating talent and filling holes for a lot of programs at the larger schools rather than waiting for a talented class to come through together.