What prices will my products go back to when I revert a price change job?
The prices of all the products affected will be changed back to what they were right before the prices were changed by that job originally. You can see exactly what those prices are by exporting the recap CSV spreadsheet, or by looking at the price change recap.
Do price change reverts count against my monthly price change limit?
Nope, price change reverts are totally free. Your monthly price change usage is only increased when you create new price change jobs that affect product variants that haven’t already been changed that month.