Today American Airlines announced some changes to AAdvantage following a review similar to Delta's. While AA's are more extensive, it's worth noting (and The New York Times reported) that they also sent an email to AAdvantage members about the change. And they did this simultaneous to the public release! Good for them.
The bulk of changes at AAdvantage are added fees and mileage requirements for upgrades. This will serve to make upgrades both more available (ok - this might be relative but it shouldn't hurt) and help the airline from a yield management standpoint, assuming it gets more business travelers to actually pay more for front cabin seats.
One thing AA did not change were reward levels for domestic coach. This is both smart and not surprising, as American has been way ahead of Delta in terms of mileage sale revenue to partners and they would be devaluing their miles by increasing reward levels.
Finally, on a related note, SkyMiles today sent out an email offer of half-price tickets for Atlanta Braves games. This follows similar moves related to their sponsorship of the Atlanta Symphony Orchestra and serves as a nice value-added "surprise and delight".