I just called and paid for my AONE4 that I booked yesterday. At that time the agent expected it not to be rated by fares until late today. aa.com showed a price (based upon the old fares) and said it was on hold, so called a few moments ago and provided payment at the price it was rated (based on old fares). Agent did not mention any potential price increases. It is now showing on request (which is normal) on aa.com.

Edited to add: About 10 minutes later and it is now ticketed at the price I expected (based upon the fares from yesterday).